fix(build): Resolve Dart analyzer issues with the Dart dev channel

Closes #8316

modules/angular2/platform/worker_render.dart

@@ -14,7 +14,7 @@ export 'package:angular2/src/platform/worker_render_common.dart'
         initializeGenericWorkerRenderer;
 
 export 'package:angular2/src/platform/worker_render.dart'
-    show WORKER_RENDER_APPLICATION, WebWorkerInstance;
+    show WebWorkerInstance;
 
 export '../src/web_workers/shared/client_message_broker.dart'
     show ClientMessageBroker, ClientMessageBrokerFactory, FnArg, UiArguments;

modules/angular2/test/common/pipes/json_pipe_spec.ts

@@ -9,7 +9,6 @@ import {
   afterEach,
   AsyncTestCompleter,
   inject,
-  proxy,
   TestComponentBuilder
 } from 'angular2/testing_internal';
 import {Json, RegExp, NumberWrapper, StringWrapper} from 'angular2/src/facade/lang';

modules/angular2/test/platform/dom/shared_styles_host_spec.ts

@@ -12,8 +12,7 @@ import {
   beforeEachProviders,
   it,
   xit,
-  SpyObject,
-  proxy
+  SpyObject
 } from 'angular2/testing_internal';
 
 import {DOM} from 'angular2/src/platform/dom/dom_adapter';

modules/angular2/test/router/directives/router_link_transform_spec.ts

@@ -1,7 +1,6 @@
 import {
   AsyncTestCompleter,
   describe,
-  proxy,
   it,
   iit,
   ddescribe,

modules/angular2/test/router/integration/router_link_spec.ts

@@ -13,7 +13,6 @@ import {
   it,
   xit,
   TestComponentBuilder,
-  proxy,
   SpyObject
 } from 'angular2/testing_internal';
 

modules/angular2/test/router/location/hash_location_strategy_spec.ts

@@ -1,7 +1,6 @@
 import {
   AsyncTestCompleter,
   describe,
-  proxy,
   it,
   iit,
   ddescribe,

modules/angular2/test/router/location/location_spec.ts

@@ -1,7 +1,6 @@
 import {
   AsyncTestCompleter,
   describe,
-  proxy,
   it,
   iit,
   ddescribe,

modules/angular2/test/router/location/path_location_strategy_spec.ts

@@ -1,7 +1,6 @@
 import {
   AsyncTestCompleter,
   describe,
-  proxy,
   it,
   iit,
   ddescribe,

modules/angular2/test/router/router_spec.ts

@@ -1,7 +1,6 @@
 import {
   AsyncTestCompleter,
   describe,
-  proxy,
   it,
   iit,
   xit,

modules/angular2/test/testing/testing_internal_spec.ts

@@ -7,7 +7,6 @@ import {
   tick,
   SpyObject,
   beforeEach,
-  proxy,
   containsRegexp
 } from 'angular2/testing_internal';
 

modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart

@@ -9,8 +9,7 @@ import "package:angular2/testing_internal.dart"
         expect,
         beforeEach,
         beforeEachProviders,
-        SpyObject,
-        proxy;
+        SpyObject;
 import "package:angular2/src/web_workers/debug_tools/web_socket_message_bus.dart";
 import "dart:html" show WebSocket, MessageEvent;
 import "./message_bus_common.dart";

modules/angular2/test/web_workers/shared/message_bus_spec.ts

@@ -6,8 +6,7 @@ import {
   expect,
   beforeEach,
   beforeEachProviders,
-  SpyObject,
-  proxy
+  SpyObject
 } from 'angular2/testing_internal';
 import {ObservableWrapper, TimerWrapper} from 'angular2/src/facade/async';
 import {MessageBus} from 'angular2/src/web_workers/shared/message_bus';

modules/angular2/test/web_workers/shared/service_message_broker_spec.ts

@@ -8,7 +8,6 @@ import {
   beforeEach,
   beforeEachProviders,
   SpyObject,
-  proxy,
   browserDetection
 } from 'angular2/testing_internal';
 import {createPairedMessageBuses} from '../shared/web_worker_test_util';