diff --git a/modules/angular2/src/change_detection/parser/locals.ts b/modules/angular2/src/change_detection/parser/locals.ts
index b45ac4f569..d7f9ac0a11 100644
--- a/modules/angular2/src/change_detection/parser/locals.ts
+++ b/modules/angular2/src/change_detection/parser/locals.ts
@@ -5,7 +5,7 @@ export class Locals {
   constructor(public parent: Locals, public current: Map<any, any>) {}
 
   contains(name: string): boolean {
-    if (MapWrapper.contains(this.current, name)) {
+    if (this.current.has(name)) {
       return true;
     }
 
@@ -17,7 +17,7 @@ export class Locals {
   }
 
   get(name: string) {
-    if (MapWrapper.contains(this.current, name)) {
+    if (this.current.has(name)) {
       return this.current.get(name);
     }
 
@@ -32,7 +32,7 @@ export class Locals {
     // TODO(rado): consider removing this check if we can guarantee this is not
     // exposed to the public API.
     // TODO: vsavkin maybe it should check only the local map
-    if (MapWrapper.contains(this.current, name)) {
+    if (this.current.has(name)) {
       this.current.set(name, value);
     } else {
       throw new BaseException(
diff --git a/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts b/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts
index e015a2bfde..f8d6b6e329 100644
--- a/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts
+++ b/modules/angular2/src/change_detection/pipes/keyvalue_changes.ts
@@ -105,7 +105,7 @@ export class KeyValueChanges extends Pipe {
           this._removeFromSeq(lastOldSeqRecord, oldSeqRecord);
           this._addToRemovals(oldSeqRecord);
         }
-        if (MapWrapper.contains(records, key)) {
+        if (records.has(key)) {
           newSeqRecord = records.get(key);
         } else {
           newSeqRecord = new KVChangeRecord(key);
diff --git a/modules/angular2/src/core/compiler/element_injector.ts b/modules/angular2/src/core/compiler/element_injector.ts
index 970305ec68..a961debbaa 100644
--- a/modules/angular2/src/core/compiler/element_injector.ts
+++ b/modules/angular2/src/core/compiler/element_injector.ts
@@ -421,7 +421,7 @@ export class ProtoElementInjector {
     var visitedIds: Map<number, boolean> = new Map();
     ListWrapper.forEach(dirBindings, dirBinding => {
       ListWrapper.forEach(dirBinding.resolvedHostInjectables, b => {
-        if (MapWrapper.contains(visitedIds, b.key.id)) {
+        if (visitedIds.has(b.key.id)) {
           throw new BaseException(
               `Multiple directives defined the same host injectable: "${stringify(b.key.token)}"`);
         }
@@ -730,7 +730,7 @@ export class ElementInjector extends TreeNode<ElementInjector> {
 
   hasVariableBinding(name: string): boolean {
     var vb = this._proto.directiveVariableBindings;
-    return isPresent(vb) && MapWrapper.contains(vb, name);
+    return isPresent(vb) && vb.has(name);
   }
 
   getVariableBinding(name: string): any {
@@ -891,7 +891,7 @@ export class ElementInjector extends TreeNode<ElementInjector> {
 
   private _buildAttribute(dep: DirectiveDependency): string {
     var attributes = this._proto.attributes;
-    if (isPresent(attributes) && MapWrapper.contains(attributes, dep.attributeName)) {
+    if (isPresent(attributes) && attributes.has(dep.attributeName)) {
       return attributes.get(dep.attributeName);
     } else {
       return null;
diff --git a/modules/angular2/src/core/compiler/proto_view_factory.ts b/modules/angular2/src/core/compiler/proto_view_factory.ts
index 86094974f5..fb0ed81d64 100644
--- a/modules/angular2/src/core/compiler/proto_view_factory.ts
+++ b/modules/angular2/src/core/compiler/proto_view_factory.ts
@@ -115,7 +115,7 @@ class BindingRecordsCreator {
                       directiveMetadata: renderApi.DirectiveMetadata): DirectiveRecord {
     var id = boundElementIndex * 100 + directiveIndex;
 
-    if (!MapWrapper.contains(this._directiveRecordsMap, id)) {
+    if (!this._directiveRecordsMap.has(id)) {
       this._directiveRecordsMap.set(
           id, new DirectiveRecord({
             directiveIndex: new DirectiveIndex(boundElementIndex, directiveIndex),
diff --git a/modules/angular2/src/core/compiler/view.ts b/modules/angular2/src/core/compiler/view.ts
index 9ef1ca5aa7..82413b7fa6 100644
--- a/modules/angular2/src/core/compiler/view.ts
+++ b/modules/angular2/src/core/compiler/view.ts
@@ -73,7 +73,7 @@ export class AppView implements ChangeDispatcher, EventDispatcher {
 
   setLocal(contextName: string, value): void {
     if (!this.hydrated()) throw new BaseException('Cannot set locals on dehydrated view.');
-    if (!MapWrapper.contains(this.proto.variableBindings, contextName)) {
+    if (!this.proto.variableBindings.has(contextName)) {
       return;
     }
     var templateName = this.proto.variableBindings.get(contextName);
diff --git a/modules/angular2/src/core/testability/testability.ts b/modules/angular2/src/core/testability/testability.ts
index 70eea10336..ff12895d97 100644
--- a/modules/angular2/src/core/testability/testability.ts
+++ b/modules/angular2/src/core/testability/testability.ts
@@ -71,7 +71,7 @@ export class TestabilityRegistry {
     if (elem == null) {
       return null;
     }
-    if (MapWrapper.contains(this._applications, elem)) {
+    if (this._applications.has(elem)) {
       return this._applications.get(elem);
     }
     if (DOM.isShadowRoot(elem)) {
diff --git a/modules/angular2/src/di/key.ts b/modules/angular2/src/di/key.ts
index d19358ab35..66298e8cd1 100644
--- a/modules/angular2/src/di/key.ts
+++ b/modules/angular2/src/di/key.ts
@@ -56,7 +56,7 @@ export class KeyRegistry {
     }
     token = theToken;
 
-    if (MapWrapper.contains(this._allKeys, token)) {
+    if (this._allKeys.has(token)) {
       return this._allKeys.get(token);
     }
 
diff --git a/modules/angular2/src/facade/collection.dart b/modules/angular2/src/facade/collection.dart
index 099dd1efe9..3cb396eca6 100644
--- a/modules/angular2/src/facade/collection.dart
+++ b/modules/angular2/src/facade/collection.dart
@@ -36,7 +36,6 @@ class MapWrapper {
     m[p[0]] = p[1];
     return m;
   });
-  static contains(Map m, k) => m.containsKey(k);
   static forEach(Map m, fn(v, k)) {
     m.forEach((k, v) => fn(v, k));
   }
diff --git a/modules/angular2/src/facade/collection.ts b/modules/angular2/src/facade/collection.ts
index 48a21268ca..a28eb7f240 100644
--- a/modules/angular2/src/facade/collection.ts
+++ b/modules/angular2/src/facade/collection.ts
@@ -64,7 +64,6 @@ export class MapWrapper {
     return result;
   }
   static createFromPairs(pairs: List<any>): Map<any, any> { return createMapFromPairs(pairs); }
-  static contains<K>(m: Map<K, any>, k: K) { return m.has(k); }
   static forEach<K, V>(m: Map<K, V>, fn: /*(V, K) => void*/ Function) { m.forEach(<any>fn); }
   static size(m: Map<any, any>) { return m.size; }
   static delete<K>(m: Map<K, any>, k: K) { m.delete(k); }
diff --git a/modules/angular2/src/http/headers.ts b/modules/angular2/src/http/headers.ts
index cf0c6efa0d..46b0bc1969 100644
--- a/modules/angular2/src/http/headers.ts
+++ b/modules/angular2/src/http/headers.ts
@@ -53,7 +53,7 @@ export class Headers {
 
   get(header: string): string { return ListWrapper.first(this._headersMap.get(header)); }
 
-  has(header: string) { return MapWrapper.contains(this._headersMap, header); }
+  has(header: string) { return this._headersMap.has(header); }
 
   keys() { return MapWrapper.keys(this._headersMap); }
 
diff --git a/modules/angular2/src/http/url_search_params.ts b/modules/angular2/src/http/url_search_params.ts
index becf9e88f4..69d8c6819d 100644
--- a/modules/angular2/src/http/url_search_params.ts
+++ b/modules/angular2/src/http/url_search_params.ts
@@ -19,7 +19,7 @@ export class URLSearchParams {
   paramsMap: Map<string, List<string>>;
   constructor(public rawParams: string) { this.paramsMap = paramParser(rawParams); }
 
-  has(param: string): boolean { return MapWrapper.contains(this.paramsMap, param); }
+  has(param: string): boolean { return this.paramsMap.has(param); }
 
   get(param: string): string { return ListWrapper.first(this.paramsMap.get(param)); }
 
diff --git a/modules/angular2/src/reflection/reflector.ts b/modules/angular2/src/reflection/reflector.ts
index d27ab4fbf3..b6f91829cc 100644
--- a/modules/angular2/src/reflection/reflector.ts
+++ b/modules/angular2/src/reflection/reflector.ts
@@ -52,7 +52,7 @@ export class Reflector {
   }
 
   parameters(typeOrFunc): List<any> {
-    if (MapWrapper.contains(this._typeInfo, typeOrFunc)) {
+    if (this._typeInfo.has(typeOrFunc)) {
       return this._getTypeInfoField(typeOrFunc, "parameters", []);
     } else {
       return this.reflectionCapabilities.parameters(typeOrFunc);
@@ -60,7 +60,7 @@ export class Reflector {
   }
 
   annotations(typeOrFunc): List<any> {
-    if (MapWrapper.contains(this._typeInfo, typeOrFunc)) {
+    if (this._typeInfo.has(typeOrFunc)) {
       return this._getTypeInfoField(typeOrFunc, "annotations", []);
     } else {
       return this.reflectionCapabilities.annotations(typeOrFunc);
@@ -68,7 +68,7 @@ export class Reflector {
   }
 
   interfaces(type): List<any> {
-    if (MapWrapper.contains(this._typeInfo, type)) {
+    if (this._typeInfo.has(type)) {
       return this._getTypeInfoField(type, "interfaces", []);
     } else {
       return this.reflectionCapabilities.interfaces(type);
@@ -76,7 +76,7 @@ export class Reflector {
   }
 
   getter(name: string): GetterFn {
-    if (MapWrapper.contains(this._getters, name)) {
+    if (this._getters.has(name)) {
       return this._getters.get(name);
     } else {
       return this.reflectionCapabilities.getter(name);
@@ -84,7 +84,7 @@ export class Reflector {
   }
 
   setter(name: string): SetterFn {
-    if (MapWrapper.contains(this._setters, name)) {
+    if (this._setters.has(name)) {
       return this._setters.get(name);
     } else {
       return this.reflectionCapabilities.setter(name);
@@ -92,7 +92,7 @@ export class Reflector {
   }
 
   method(name: string): MethodFn {
-    if (MapWrapper.contains(this._methods, name)) {
+    if (this._methods.has(name)) {
       return this._methods.get(name);
     } else {
       return this.reflectionCapabilities.method(name);
@@ -104,7 +104,7 @@ export class Reflector {
     return isPresent(res) ? res : defaultValue;
   }
 
-  _containsTypeInfo(typeOrFunc) { return MapWrapper.contains(this._typeInfo, typeOrFunc); }
+  _containsTypeInfo(typeOrFunc) { return this._typeInfo.has(typeOrFunc); }
 }
 
 function _mergeMaps(target: Map<any, any>, config: StringMap<string, Function>): void {
diff --git a/modules/angular2/src/render/dom/shadow_dom/util.ts b/modules/angular2/src/render/dom/shadow_dom/util.ts
index bbb1e86250..779998f16a 100644
--- a/modules/angular2/src/render/dom/shadow_dom/util.ts
+++ b/modules/angular2/src/render/dom/shadow_dom/util.ts
@@ -20,7 +20,7 @@ export function getComponentId(componentStringId: string) {
 }
 
 export function insertSharedStyleText(cssText, styleHost, styleEl) {
-  if (!MapWrapper.contains(_sharedStyleTexts, cssText)) {
+  if (!_sharedStyleTexts.has(cssText)) {
     // Styles are unscoped and shared across components, only append them to the head
     // when there are not present yet
     _sharedStyleTexts.set(cssText, true);
diff --git a/modules/angular2/src/render/xhr_mock.ts b/modules/angular2/src/render/xhr_mock.ts
index 606f63acb8..4be22e7b0a 100644
--- a/modules/angular2/src/render/xhr_mock.ts
+++ b/modules/angular2/src/render/xhr_mock.ts
@@ -65,7 +65,7 @@ export class MockXHR extends XHR {
       }
     }
 
-    if (MapWrapper.contains(this._definitions, url)) {
+    if (this._definitions.has(url)) {
       var response = this._definitions.get(url);
       request.complete(normalizeBlank(response));
       return;
diff --git a/modules/angular2/src/router/route_recognizer.ts b/modules/angular2/src/router/route_recognizer.ts
index 440d54f598..5df91aa439 100644
--- a/modules/angular2/src/router/route_recognizer.ts
+++ b/modules/angular2/src/router/route_recognizer.ts
@@ -90,7 +90,7 @@ export class RouteRecognizer {
     return solutions;
   }
 
-  hasRoute(name: string): boolean { return MapWrapper.contains(this.names, name); }
+  hasRoute(name: string): boolean { return this.names.has(name); }
 
   generate(name: string, params: any): string {
     var pathRecognizer = this.names.get(name);
diff --git a/modules/angular2/src/router/route_registry.ts b/modules/angular2/src/router/route_registry.ts
index 92a2de95e3..3b7a5e4ad4 100644
--- a/modules/angular2/src/router/route_registry.ts
+++ b/modules/angular2/src/router/route_registry.ts
@@ -69,7 +69,7 @@ export class RouteRegistry {
 
     // Don't read the annotations from a type more than once –
     // this prevents an infinite loop if a component routes recursively.
-    if (MapWrapper.contains(this._rules, component)) {
+    if (this._rules.has(component)) {
       return;
     }
     var annotations = reflector.annotations(component);
diff --git a/modules/angular2/test/render/dom/compiler/pipeline_spec.ts b/modules/angular2/test/render/dom/compiler/pipeline_spec.ts
index 522a49a77a..fa2197f4be 100644
--- a/modules/angular2/test/render/dom/compiler/pipeline_spec.ts
+++ b/modules/angular2/test/render/dom/compiler/pipeline_spec.ts
@@ -198,7 +198,7 @@ class MockStep implements CompileStep {
 export class IgnoreChildrenStep implements CompileStep {
   process(parent: CompileElement, current: CompileElement, control: CompileControl) {
     var attributeMap = DOM.attributeMap(current.element);
-    if (MapWrapper.contains(attributeMap, 'ignore-children')) {
+    if (attributeMap.has('ignore-children')) {
       current.compileChildren = false;
     }
   }
@@ -207,7 +207,7 @@ export class IgnoreChildrenStep implements CompileStep {
 class IgnoreCurrentElementStep implements CompileStep {
   process(parent: CompileElement, current: CompileElement, control: CompileControl) {
     var attributeMap = DOM.attributeMap(current.element);
-    if (MapWrapper.contains(attributeMap, 'ignore-current')) {
+    if (attributeMap.has('ignore-current')) {
       control.ignoreCurrentElement();
     }
   }
diff --git a/modules/angular2/test/render/dom/events/event_manager_spec.ts b/modules/angular2/test/render/dom/events/event_manager_spec.ts
index 8dc5bc969e..35a49f9889 100644
--- a/modules/angular2/test/render/dom/events/event_manager_spec.ts
+++ b/modules/angular2/test/render/dom/events/event_manager_spec.ts
@@ -52,9 +52,9 @@ export function main() {
       var manager = new EventManager([plugin1, plugin2], new FakeNgZone());
       manager.addEventListener(element, 'click', clickHandler);
       manager.addEventListener(element, 'dblclick', dblClickHandler);
-      expect(MapWrapper.contains(plugin1._nonBubbleEventHandlers, 'click')).toBe(false);
+      expect(plugin1._nonBubbleEventHandlers.has('click')).toBe(false);
       expect(plugin2._nonBubbleEventHandlers.get('click')).toBe(clickHandler);
-      expect(MapWrapper.contains(plugin2._nonBubbleEventHandlers, 'dblclick')).toBe(false);
+      expect(plugin2._nonBubbleEventHandlers.has('dblclick')).toBe(false);
       expect(plugin1._nonBubbleEventHandlers.get('dblclick')).toBe(dblClickHandler);
     });