refactor(various): remove a few lingering but unused deprecated apis (#10896)

Removes deprecated APPLICATION_COMMON_PROVIDERS, as well as some
internal apis that were deprecated.

modules/@angular/core/testing/mock_application_ref.ts

@@ -1,36 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-
-import {ApplicationRef, ComponentFactory, ComponentRef, Injectable, Injector, NgZone, Type} from '../index';
-
-
-/**
- * A no-op implementation of {@link ApplicationRef}, useful for testing.
- */
-@Injectable()
-export class MockApplicationRef extends ApplicationRef {
-  registerBootstrapListener(listener: (ref: ComponentRef<any>) => void): void {}
-
-  registerDisposeListener(dispose: () => void): void {}
-
-  bootstrap<C>(componentFactory: ComponentFactory<C>): ComponentRef<C> { return null; }
-
-  get injector(): Injector { return null; };
-
-  get zone(): NgZone { return null; };
-
-  run(callback: Function): any { return null; }
-
-  waitForAsyncInitializers(): Promise<any> { return null; }
-
-  dispose(): void {}
-
-  tick(): void {}
-
-  get componentTypes(): Type<any>[] { return null; };
-}

modules/@angular/core/testing/testing_internal.ts

@@ -17,7 +17,6 @@ export {MockAnimationPlayer} from './mock_animation_player';
 export {inject} from './test_bed';
 export * from './logger';
 export * from './ng_zone_mock';
-export * from './mock_application_ref';
 export * from './test_component_builder';
 
 export var proxy: ClassDecorator = (t: any /** TODO #9100 */) => t;