diff --git a/modules/angular2/src/core/change_detection/codegen_name_util.ts b/modules/angular2/src/core/change_detection/codegen_name_util.ts
index a797e973a3..00d4fb5698 100644
--- a/modules/angular2/src/core/change_detection/codegen_name_util.ts
+++ b/modules/angular2/src/core/change_detection/codegen_name_util.ts
@@ -83,7 +83,7 @@ export class CodegenNameUtil {
   getLocalName(idx: number): string { return `l_${this._sanitizedNames[idx]}`; }
 
   getEventLocalName(eb: EventBinding, idx: number): string {
-    return `l_${MapWrapper.get(this._sanitizedEventNames, eb)[idx]}`;
+    return `l_${this._sanitizedEventNames.get(eb)[idx]}`;
   }
 
   getChangeName(idx: number): string { return `c_${this._sanitizedNames[idx]}`; }
@@ -118,7 +118,7 @@ export class CodegenNameUtil {
    */
   genInitEventLocals(): string {
     var res = [`${this.getLocalName(CONTEXT_INDEX)} = ${this.getFieldName(CONTEXT_INDEX)}`];
-    MapWrapper.forEach(this._sanitizedEventNames, (names, eb) => {
+    this._sanitizedEventNames.forEach((names, eb) => {
       for (var i = 0; i < names.length; ++i) {
         if (i !== CONTEXT_INDEX) {
           res.push(`${this.getEventLocalName(eb, i)}`);
diff --git a/modules/angular2/src/core/change_detection/differs/default_iterable_differ.ts b/modules/angular2/src/core/change_detection/differs/default_iterable_differ.ts
index 51fbfb5aed..ead34c94a6 100644
--- a/modules/angular2/src/core/change_detection/differs/default_iterable_differ.ts
+++ b/modules/angular2/src/core/change_detection/differs/default_iterable_differ.ts
@@ -608,12 +608,12 @@ class _DuplicateMap {
     var recordList: _DuplicateItemRecordList = this.map.get(key);
     // Remove the list of duplicates when it gets empty
     if (recordList.remove(record)) {
-      MapWrapper.delete(this.map, key);
+      this.map.delete(key);
     }
     return record;
   }
 
-  get isEmpty(): boolean { return MapWrapper.size(this.map) === 0; }
+  get isEmpty(): boolean { return this.map.size === 0; }
 
   clear() { this.map.clear(); }
 
diff --git a/modules/angular2/src/core/change_detection/differs/default_keyvalue_differ.ts b/modules/angular2/src/core/change_detection/differs/default_keyvalue_differ.ts
index 77d85c988a..0c0756ec83 100644
--- a/modules/angular2/src/core/change_detection/differs/default_keyvalue_differ.ts
+++ b/modules/angular2/src/core/change_detection/differs/default_keyvalue_differ.ts
@@ -1,4 +1,4 @@
-import {ListWrapper, MapWrapper, StringMapWrapper} from 'angular2/src/core/facade/collection';
+import {MapWrapper, StringMapWrapper} from 'angular2/src/core/facade/collection';
 import {stringify, looseIdentical, isJsObject, CONST, isBlank} from 'angular2/src/core/facade/lang';
 import {BaseException} from 'angular2/src/core/facade/exceptions';
 import {ChangeDetectorRef} from '../change_detector_ref';
@@ -197,7 +197,7 @@ export class DefaultKeyValueDiffer implements KeyValueDiffer {
     for (var rec: KVChangeRecord = this._removalsHead; rec !== null; rec = rec._nextRemoved) {
       rec.previousValue = rec.currentValue;
       rec.currentValue = null;
-      MapWrapper.delete(this._records, rec.key);
+      this._records.delete(rec.key);
     }
   }
 
@@ -317,7 +317,7 @@ export class DefaultKeyValueDiffer implements KeyValueDiffer {
 
   _forEach(obj, fn: Function) {
     if (obj instanceof Map) {
-      MapWrapper.forEach(obj, fn);
+      (<Map<any, any>>obj).forEach(<any>fn);
     } else {
       StringMapWrapper.forEach(obj, fn);
     }
diff --git a/modules/angular2/src/core/debug/debug_element_view_listener.ts b/modules/angular2/src/core/debug/debug_element_view_listener.ts
index 2d394e9136..13220876de 100644
--- a/modules/angular2/src/core/debug/debug_element_view_listener.ts
+++ b/modules/angular2/src/core/debug/debug_element_view_listener.ts
@@ -62,8 +62,8 @@ export class DebugElementViewListener implements AppViewListener {
 
   viewDestroyed(view: AppView) {
     var viewId = _allIdsByView.get(view);
-    MapWrapper.delete(_allIdsByView, view);
-    MapWrapper.delete(_allViewsById, viewId);
+    _allIdsByView.delete(view);
+    _allViewsById.delete(viewId);
   }
 }
 
diff --git a/modules/angular2/src/core/di/key.ts b/modules/angular2/src/core/di/key.ts
index 6c46876276..0f99d12125 100644
--- a/modules/angular2/src/core/di/key.ts
+++ b/modules/angular2/src/core/di/key.ts
@@ -1,4 +1,3 @@
-import {MapWrapper} from 'angular2/src/core/facade/collection';
 import {stringify, CONST, Type, isBlank} from 'angular2/src/core/facade/lang';
 import {BaseException, WrappedException} from 'angular2/src/core/facade/exceptions';
 import {TypeLiteral} from './type_literal';
@@ -70,7 +69,7 @@ export class KeyRegistry {
     return newKey;
   }
 
-  get numberOfKeys(): number { return MapWrapper.size(this._allKeys); }
+  get numberOfKeys(): number { return this._allKeys.size; }
 }
 
 var _globalKeyRegistry = new KeyRegistry();
diff --git a/modules/angular2/src/core/facade/collection.dart b/modules/angular2/src/core/facade/collection.dart
index a097345b6b..359356aa86 100644
--- a/modules/angular2/src/core/facade/collection.dart
+++ b/modules/angular2/src/core/facade/collection.dart
@@ -45,15 +45,6 @@ class MapWrapper {
         m[p[0]] = p[1];
         return m;
       });
-  static forEach(Map m, fn(v, k)) {
-    m.forEach((k, v) => fn(v, k));
-  }
-
-  static get(Map map, key) => map[key];
-  static int size(Map m) => m.length;
-  static void delete(Map m, k) {
-    m.remove(k);
-  }
 
   static void clearValues(Map m) {
     for (var k in m.keys) {
diff --git a/modules/angular2/src/core/facade/collection.ts b/modules/angular2/src/core/facade/collection.ts
index 8d6d527c34..d14731797a 100644
--- a/modules/angular2/src/core/facade/collection.ts
+++ b/modules/angular2/src/core/facade/collection.ts
@@ -91,10 +91,6 @@ export class MapWrapper {
     return r;
   }
   static createFromPairs(pairs: any[]): Map<any, any> { return createMapFromPairs(pairs); }
-  static forEach<K, V>(m: Map<K, V>, fn: /*(V, K) => void*/ Function) { m.forEach(<any>fn); }
-  static get<K, V>(map: Map<K, V>, key: K): V { return map.get(key); }
-  static size(m: Map<any, any>): number { return m.size; }
-  static delete<K>(m: Map<K, any>, k: K) { m.delete(k); }
   static clearValues(m: Map<any, any>) { _clearValues(m); }
   static iterable<T>(m: T): T { return m; }
   static keys<K>(m: Map<K, any>): K[] { return _arrayFromMap(m, false); }
diff --git a/modules/angular2/src/core/linker/view.ts b/modules/angular2/src/core/linker/view.ts
index eff1f70382..7f9d779309 100644
--- a/modules/angular2/src/core/linker/view.ts
+++ b/modules/angular2/src/core/linker/view.ts
@@ -336,8 +336,8 @@ export class AppProtoView {
     this.variableLocations = variableLocations;
     this.protoLocals = new Map<string, any>();
     if (isPresent(this.templateVariableBindings)) {
-      MapWrapper.forEach(this.templateVariableBindings,
-                         (templateName, _) => { this.protoLocals.set(templateName, null); });
+      this.templateVariableBindings.forEach(
+          (templateName, _) => { this.protoLocals.set(templateName, null); });
     }
     if (isPresent(variableLocations)) {
       // The view's locals needs to have a full set of variable names at construction time
@@ -345,8 +345,7 @@ export class AppProtoView {
       // want
       // to actually create variable bindings for the $implicit bindings, add to the
       // protoLocals manually.
-      MapWrapper.forEach(variableLocations,
-                         (_, templateName) => { this.protoLocals.set(templateName, null); });
+      variableLocations.forEach((_, templateName) => { this.protoLocals.set(templateName, null); });
     }
   }
 
diff --git a/modules/angular2/src/core/linker/view_manager_utils.ts b/modules/angular2/src/core/linker/view_manager_utils.ts
index 0742d79a4b..68cf8b8420 100644
--- a/modules/angular2/src/core/linker/view_manager_utils.ts
+++ b/modules/angular2/src/core/linker/view_manager_utils.ts
@@ -216,7 +216,7 @@ export class AppViewManagerUtils {
   _populateViewLocals(view: viewModule.AppView, elementInjector: eli.ElementInjector,
                       boundElementIdx: number): void {
     if (isPresent(elementInjector.getDirectiveVariableBindings())) {
-      MapWrapper.forEach(elementInjector.getDirectiveVariableBindings(), (directiveIndex, name) => {
+      elementInjector.getDirectiveVariableBindings().forEach((directiveIndex, name) => {
         if (isBlank(directiveIndex)) {
           view.locals.set(name, view.elementRefs[boundElementIdx].nativeElement);
         } else {
diff --git a/modules/angular2/src/http/backends/xhr_backend.ts b/modules/angular2/src/http/backends/xhr_backend.ts
index 3cd05e3d2e..9ec606fca9 100644
--- a/modules/angular2/src/http/backends/xhr_backend.ts
+++ b/modules/angular2/src/http/backends/xhr_backend.ts
@@ -64,7 +64,7 @@ export class XHRConnection implements Connection {
       };
 
       if (isPresent(req.headers)) {
-        req.headers.forEach((values, name) => { _xhr.setRequestHeader(name, values.join(',')); });
+        req.headers.forEach((values, name) => _xhr.setRequestHeader(name, values.join(',')));
       }
 
       _xhr.addEventListener('load', onLoad);
diff --git a/modules/angular2/src/http/headers.ts b/modules/angular2/src/http/headers.ts
index 37ffc71881..42b0a06543 100644
--- a/modules/angular2/src/http/headers.ts
+++ b/modules/angular2/src/http/headers.ts
@@ -4,6 +4,7 @@ import {
   isListLikeIterable,
   Map,
   MapWrapper,
+  StringMapWrapper,
   ListWrapper,
 } from 'angular2/src/core/facade/collection';
 
@@ -36,23 +37,20 @@ import {
 export class Headers {
   _headersMap: Map<string, string[]>;
   constructor(headers?: Headers | {[key: string]: any}) {
-    if (isBlank(headers)) {
-      this._headersMap = new Map<string, string[]>();
+    if (headers instanceof Headers) {
+      this._headersMap = (<Headers>headers)._headersMap;
       return;
     }
 
-    if (headers instanceof Headers) {
-      this._headersMap = (<Headers>headers)._headersMap;
-    } else /*if (headers instanceof StringMap)*/ {
-      this._headersMap = MapWrapper.createFromStringMap<string[]>(<{[key: string]: any}>headers);
-      MapWrapper.forEach(this._headersMap, (v, k) => {
-        if (!isListLikeIterable(v)) {
-          var list = [];
-          list.push(v);
-          this._headersMap.set(k, list);
-        }
-      });
+    this._headersMap = new Map<string, string[]>();
+
+    if (isBlank(headers)) {
+      return;
     }
+
+    // headers instanceof StringMap
+    StringMapWrapper.forEach(
+        headers, (v, k) => { this._headersMap.set(k, isListLikeIterable(v) ? v : [v]); });
   }
 
   /**
@@ -68,10 +66,10 @@ export class Headers {
   /**
    * Deletes all header values for the given name.
    */
-  delete (name: string): void { MapWrapper.delete(this._headersMap, name); }
+  delete (name: string): void { this._headersMap.delete(name); }
 
   forEach(fn: (values: string[], name: string, headers: Map<string, string[]>) => void): void {
-    MapWrapper.forEach(this._headersMap, fn);
+    this._headersMap.forEach(fn);
   }
 
   /**
diff --git a/modules/angular2/src/http/url_search_params.ts b/modules/angular2/src/http/url_search_params.ts
index 6fe45116f0..96c23ed461 100644
--- a/modules/angular2/src/http/url_search_params.ts
+++ b/modules/angular2/src/http/url_search_params.ts
@@ -71,7 +71,7 @@ export class URLSearchParams {
   //
   // TODO(@caitp): document this better
   setAll(searchParams: URLSearchParams) {
-    MapWrapper.forEach(searchParams.paramsMap, (value, param) => {
+    searchParams.paramsMap.forEach((value, param) => {
       var mapParam = this.paramsMap.get(param);
       var list = isPresent(mapParam) ? mapParam : [];
       ListWrapper.clear(list);
@@ -95,7 +95,7 @@ export class URLSearchParams {
   //
   // TODO(@caitp): document this better
   appendAll(searchParams: URLSearchParams) {
-    MapWrapper.forEach(searchParams.paramsMap, (value, param) => {
+    searchParams.paramsMap.forEach((value, param) => {
       var mapParam = this.paramsMap.get(param);
       var list = isPresent(mapParam) ? mapParam : [];
       for (var i = 0; i < value.length; ++i) {
@@ -114,7 +114,7 @@ export class URLSearchParams {
   //
   // TODO(@caitp): document this better
   replaceAll(searchParams: URLSearchParams) {
-    MapWrapper.forEach(searchParams.paramsMap, (value, param) => {
+    searchParams.paramsMap.forEach((value, param) => {
       var mapParam = this.paramsMap.get(param);
       var list = isPresent(mapParam) ? mapParam : [];
       ListWrapper.clear(list);
@@ -127,10 +127,9 @@ export class URLSearchParams {
 
   toString(): string {
     var paramsList = [];
-    MapWrapper.forEach(this.paramsMap,
-                       (values, k) => { values.forEach(v => paramsList.push(k + '=' + v)); });
+    this.paramsMap.forEach((values, k) => { values.forEach(v => paramsList.push(k + '=' + v)); });
     return paramsList.join('&');
   }
 
-  delete (param: string): void { MapWrapper.delete(this.paramsMap, param); }
+  delete (param: string): void { this.paramsMap.delete(param); }
 }
diff --git a/modules/angular2/src/mock/view_resolver_mock.ts b/modules/angular2/src/mock/view_resolver_mock.ts
index 03d59de5a9..3356eb102c 100644
--- a/modules/angular2/src/mock/view_resolver_mock.ts
+++ b/modules/angular2/src/mock/view_resolver_mock.ts
@@ -80,7 +80,7 @@ export class MockViewResolver extends ViewResolver {
 
     if (isPresent(overrides) && isPresent(directives)) {
       directives = ListWrapper.clone(view.directives);
-      MapWrapper.forEach(overrides, (to, from) => {
+      overrides.forEach((to, from) => {
         var srcIndex = directives.indexOf(from);
         if (srcIndex == -1) {
           throw new BaseException(
diff --git a/modules/angular2/src/router/router.ts b/modules/angular2/src/router/router.ts
index f6d66096ea..79f2e07e2e 100644
--- a/modules/angular2/src/router/router.ts
+++ b/modules/angular2/src/router/router.ts
@@ -328,9 +328,8 @@ export class Router {
     }
 
     var promises = [];
-    MapWrapper.forEach(this._auxRouters, (router, name) => {
-      promises.push(router.commit(instruction.auxInstruction[name]));
-    });
+    this._auxRouters.forEach(
+        (router, name) => { promises.push(router.commit(instruction.auxInstruction[name])); });
 
     return next.then((_) => PromiseWrapper.all(promises));
   }
diff --git a/modules/angular2/src/test_lib/test_component_builder.ts b/modules/angular2/src/test_lib/test_component_builder.ts
index a67b91a1e4..01f6c2c908 100644
--- a/modules/angular2/src/test_lib/test_component_builder.ts
+++ b/modules/angular2/src/test_lib/test_component_builder.ts
@@ -169,14 +169,12 @@ export class TestComponentBuilder {
   createAsync(rootComponentType: Type): Promise<RootTestComponent> {
     var mockDirectiveResolver = this._injector.get(DirectiveResolver);
     var mockViewResolver = this._injector.get(ViewResolver);
-    MapWrapper.forEach(this._viewOverrides,
-                       (view, type) => { mockViewResolver.setView(type, view); });
-    MapWrapper.forEach(this._templateOverrides,
-                       (template, type) => { mockViewResolver.setInlineTemplate(type, template); });
-    MapWrapper.forEach(this._directiveOverrides, (overrides, component) => {
-      MapWrapper.forEach(overrides, (to, from) => {
-        mockViewResolver.overrideViewDirective(component, from, to);
-      });
+    this._viewOverrides.forEach((view, type) => mockViewResolver.setView(type, view));
+    this._templateOverrides.forEach((template, type) =>
+                                        mockViewResolver.setInlineTemplate(type, template));
+    this._directiveOverrides.forEach((overrides, component) => {
+      overrides.forEach(
+          (to, from) => { mockViewResolver.overrideViewDirective(component, from, to); });
     });
 
     this._bindingsOverrides.forEach((bindings, type) =>
diff --git a/modules/angular2/src/test_lib/utils.ts b/modules/angular2/src/test_lib/utils.ts
index 78907b5537..328fe75e7d 100644
--- a/modules/angular2/src/test_lib/utils.ts
+++ b/modules/angular2/src/test_lib/utils.ts
@@ -105,7 +105,7 @@ export function stringifyElement(el): string {
     // Attributes in an ordered way
     var attributeMap = DOM.attributeMap(el);
     var keys = [];
-    MapWrapper.forEach(attributeMap, (v, k) => { keys.push(k); });
+    attributeMap.forEach((v, k) => keys.push(k));
     ListWrapper.sort(keys);
     for (let i = 0; i < keys.length; i++) {
       var key = keys[i];
diff --git a/modules/angular2/src/web_workers/shared/render_view_with_fragments_store.ts b/modules/angular2/src/web_workers/shared/render_view_with_fragments_store.ts
index 092272b7e4..5acf0ece69 100644
--- a/modules/angular2/src/web_workers/shared/render_view_with_fragments_store.ts
+++ b/modules/angular2/src/web_workers/shared/render_view_with_fragments_store.ts
@@ -54,13 +54,13 @@ export class RenderViewWithFragmentsStore {
     this._removeRef(view);
     var fragments = this._viewFragments.get(view);
     fragments.forEach((fragment) => { this._removeRef(fragment); });
-    MapWrapper.delete(this._viewFragments, view);
+    this._viewFragments.delete(view);
   }
 
   private _removeRef(ref: RenderViewRef | RenderFragmentRef) {
     var index = this._lookupByView.get(ref);
-    MapWrapper.delete(this._lookupByView, ref);
-    MapWrapper.delete(this._lookupByIndex, index);
+    this._lookupByView.delete(ref);
+    this._lookupByIndex.delete(index);
   }
 
   serializeRenderViewRef(viewRef: RenderViewRef): number {
diff --git a/modules/angular2/src/web_workers/shared/serializer.ts b/modules/angular2/src/web_workers/shared/serializer.ts
index c9118de6bb..ce6f190897 100644
--- a/modules/angular2/src/web_workers/shared/serializer.ts
+++ b/modules/angular2/src/web_workers/shared/serializer.ts
@@ -104,7 +104,7 @@ export class Serializer {
     var object = {};
     var serialize = isPresent(type);
 
-    MapWrapper.forEach(map, (value, key) => {
+    map.forEach((value, key) => {
       if (serialize) {
         object[key] = this.serialize(value, type);
       } else {
diff --git a/modules/angular2/test/core/change_detection/change_detector_config.ts b/modules/angular2/test/core/change_detection/change_detector_config.ts
index ee36691657..a69c69dd42 100644
--- a/modules/angular2/test/core/change_detection/change_detector_config.ts
+++ b/modules/angular2/test/core/change_detection/change_detector_config.ts
@@ -53,7 +53,7 @@ function _convertLocalsToVariableBindings(locals: Locals): any[] {
   var variableBindings = [];
   var loc = locals;
   while (isPresent(loc) && isPresent(loc.current)) {
-    MapWrapper.forEach(loc.current, (v, k) => variableBindings.push(k));
+    loc.current.forEach((v, k) => variableBindings.push(k));
     loc = loc.parent;
   }
   return variableBindings;
diff --git a/modules/angular2/test/core/change_detection/differs/default_keyvalue_differ_spec.ts b/modules/angular2/test/core/change_detection/differs/default_keyvalue_differ_spec.ts
index eb9a74bc05..59158c9b41 100644
--- a/modules/angular2/test/core/change_detection/differs/default_keyvalue_differ_spec.ts
+++ b/modules/angular2/test/core/change_detection/differs/default_keyvalue_differ_spec.ts
@@ -4,7 +4,6 @@ import {
   DefaultKeyValueDifferFactory
 } from 'angular2/src/core/change_detection/differs/default_keyvalue_differ';
 import {NumberWrapper, isJsObject} from 'angular2/src/core/facade/lang';
-import {MapWrapper} from 'angular2/src/core/facade/collection';
 import {kvChangesAsString} from '../../../core/change_detection/util';
 
 // todo(vicb): Update the code & tests for object equality
@@ -95,7 +94,7 @@ export function main() {
               changes: ['b[B->BB]']
             }));
 
-        MapWrapper.delete(m, 'b');
+        m.delete('b');
         differ.check(m);
         expect(differ.toString())
             .toEqual(kvChangesAsString(
diff --git a/modules/angular2/test/core/render/dom/events/event_manager_spec.ts b/modules/angular2/test/core/render/dom/events/event_manager_spec.ts
index 59853be3c3..f4e685fdbd 100644
--- a/modules/angular2/test/core/render/dom/events/event_manager_spec.ts
+++ b/modules/angular2/test/core/render/dom/events/event_manager_spec.ts
@@ -102,7 +102,7 @@ class FakeEventManagerPlugin extends EventManagerPlugin {
 
   addEventListener(element, eventName: string, handler: Function) {
     this._eventHandler.set(eventName, handler);
-    return () => { MapWrapper.delete(this._eventHandler, eventName); };
+    return () => { this._eventHandler.delete(eventName); };
   }
 }
 
diff --git a/modules/benchmarks/src/naive_infinite_scroll/common.ts b/modules/benchmarks/src/naive_infinite_scroll/common.ts
index 80da8c3124..6ad86841c6 100644
--- a/modules/benchmarks/src/naive_infinite_scroll/common.ts
+++ b/modules/benchmarks/src/naive_infinite_scroll/common.ts
@@ -87,7 +87,7 @@ export class RawEntity {
 
   remove(key: string) {
     if (!StringWrapper.contains(key, '.')) {
-      return MapWrapper.delete(this._data, key);
+      return this._data.delete(key);
     }
     var pieces = key.split('.');
     var last = ListWrapper.last(pieces);