Revert "fix(animations): cleanup DOM elements when the root view is removed (#41001)" (#41056)

This reverts commit a31da48507.

PR Close #41056

packages/platform-browser/animations/src/providers.ts

@@ -9,22 +9,18 @@
 import {AnimationBuilder} from '@angular/animations';
 import {AnimationDriver, ɵAnimationEngine as AnimationEngine, ɵAnimationStyleNormalizer as AnimationStyleNormalizer, ɵCssKeyframesDriver as CssKeyframesDriver, ɵNoopAnimationDriver as NoopAnimationDriver, ɵsupportsWebAnimations as supportsWebAnimations, ɵWebAnimationsDriver as WebAnimationsDriver, ɵWebAnimationsStyleNormalizer as WebAnimationsStyleNormalizer} from '@angular/animations/browser';
 import {DOCUMENT} from '@angular/common';
-import {Inject, Injectable, InjectionToken, NgZone, OnDestroy, Provider, RendererFactory2} from '@angular/core';
+import {Inject, Injectable, InjectionToken, NgZone, Provider, RendererFactory2} from '@angular/core';
 import {ɵDomRendererFactory2 as DomRendererFactory2} from '@angular/platform-browser';
 
 import {BrowserAnimationBuilder} from './animation_builder';
 import {AnimationRendererFactory} from './animation_renderer';
 
 @Injectable()
-export class InjectableAnimationEngine extends AnimationEngine implements OnDestroy {
+export class InjectableAnimationEngine extends AnimationEngine {
   constructor(
       @Inject(DOCUMENT) doc: any, driver: AnimationDriver, normalizer: AnimationStyleNormalizer) {
     super(doc.body, driver, normalizer);
   }
-
-  ngOnDestroy(): void {
-    this.flush();
-  }
 }
 
 export function instantiateSupportedAnimationDriver() {

packages/platform-browser/animations/test/animation_renderer_spec.ts

@@ -7,12 +7,10 @@
  */
 import {animate, AnimationPlayer, AnimationTriggerMetadata, state, style, transition, trigger} from '@angular/animations';
 import {ɵAnimationEngine as AnimationEngine} from '@angular/animations/browser';
-import {Component, destroyPlatform, Injectable, NgModule, NgZone, RendererFactory2, RendererType2, ViewChild} from '@angular/core';
+import {Component, Injectable, NgZone, RendererFactory2, RendererType2, ViewChild} from '@angular/core';
 import {TestBed} from '@angular/core/testing';
-import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
 import {BrowserAnimationsModule, ɵAnimationRendererFactory as AnimationRendererFactory, ɵInjectableAnimationEngine as InjectableAnimationEngine} from '@angular/platform-browser/animations';
 import {DomRendererFactory2} from '@angular/platform-browser/src/dom/dom_renderer';
-import {onlyInIvy, withBody} from '@angular/private/testing';
 
 import {el} from '../../testing/src/browser_util';
 
@@ -325,37 +323,6 @@ describe('AnimationRendererFactory', () => {
     expect(renderer.log).toEqual(['begin', 'end']);
   });
 });
-
-onlyInIvy('View Engine uses another mechanism of removing DOM nodes').describe('destroy', () => {
-  beforeEach(destroyPlatform);
-  afterEach(destroyPlatform);
-
-  it('should clear bootstrapped component contents',
-     withBody('<div>before</div><app-root></app-root><div>after</div>', async () => {
-       @Component({selector: 'app-root', template: 'app-root content'})
-       class AppComponent {
-       }
-
-       @NgModule({
-         imports: [BrowserAnimationsModule],
-         declarations: [AppComponent],
-         bootstrap: [AppComponent]
-       })
-       class AppModule {
-       }
-
-       const ngModuleRef = await platformBrowserDynamic().bootstrapModule(AppModule);
-
-       const root = document.body.querySelector('app-root')!;
-       expect(root.textContent).toEqual('app-root content');
-       expect(document.body.childNodes.length).toEqual(3);
-
-       ngModuleRef.destroy();
-
-       expect(document.body.querySelector('app-root')).toBeFalsy();  // host element is removed
-       expect(document.body.childNodes.length).toEqual(2);           // other elements are preserved
-     }));
-});
 })();
 
 @Injectable()