chore(tests): enable lint, make it green. (#10224)

modules/@angular/platform-browser/test/dom/events/event_manager_spec.ts

@@ -91,6 +91,7 @@ export function main() {
 }
 
 class FakeEventManagerPlugin extends EventManagerPlugin {
+  /** @internal */
   _eventHandler = new Map<string, Function>();
   constructor(public _supports: string[]) { super(); }
 

modules/@angular/platform-browser/test/dom/web_animations_driver_spec.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {AsyncTestCompleter, beforeEach, beforeEachProviders, ddescribe, describe, expect, iit, inject, it, xdescribe, xit} from '@angular/core/testing/testing_internal';
+import {beforeEach, beforeEachProviders, ddescribe, describe, expect, iit, inject, it, xdescribe, xit} from '@angular/core/testing/testing_internal';
 import {el} from '@angular/platform-browser/testing/browser_util';
 
 import {AnimationKeyframe, AnimationStyles} from '../../core_private';
@@ -21,6 +21,7 @@ class ExtendedWebAnimationsDriver extends WebAnimationsDriver {
 
   constructor() { super(); }
 
+  /** @internal */
   _triggerWebAnimation(elm: any, keyframes: any[], options: any): DomAnimatePlayer {
     this.log.push({'elm': elm, 'keyframes': keyframes, 'options': options});
     return new MockDomAnimatePlayer();

modules/@angular/platform-browser/test/dom/web_animations_player_spec.ts

@@ -22,6 +22,7 @@ class ExtendedWebAnimationsPlayer extends WebAnimationsPlayer {
     super(element, keyframes, options);
   }
 
+  /** @internal */
   _triggerWebAnimation(elm: any, keyframes: any[], options: any): DomAnimatePlayer {
     return this.domPlayer;
   }