cleanup(testing): create top level files for mocks

Closes #5381

modules/angular2/src/compiler/xhr_mock.ts

@@ -31,10 +31,10 @@ export class MockXHR extends XHR {
       this._processRequest(this._requests.shift());
     } while (this._requests.length > 0);
 
-    this.verifyNoOustandingExpectations();
+    this.verifyNoOutstandingExpectations();
   }
 
-  verifyNoOustandingExpectations() {
+  verifyNoOutstandingExpectations() {
     if (this._expectations.length === 0) return;
 
     var urls = [];

modules/angular2/src/http/backends/xhr_backend.ts

@@ -7,7 +7,7 @@ import {ResponseOptions, BaseResponseOptions} from '../base_response_options';
 import {Injectable} from 'angular2/core';
 import {BrowserXhr} from './browser_xhr';
 import {isPresent} from 'angular2/src/facade/lang';
-import {Observable} from 'angular2/angular2';
+import {Observable} from 'angular2/core';
 import {isSuccess, getResponseURL} from '../http_utils';
 /**
 * Creates connections using `XMLHttpRequest`. Given a fully-qualified

modules/angular2/src/router/route_registry.ts

@@ -24,7 +24,7 @@ import {
   RouteDefinition
 } from './route_config_impl';
 import {reflector} from 'angular2/src/core/reflection/reflection';
-import {Injectable} from 'angular2/angular2';
+import {Injectable} from 'angular2/core';
 import {normalizeRouteConfig, assertComponentExists} from './route_config_nomalizer';
 import {parser, Url, pathSegmentsToUrl} from './url_parser';