fix(platform-browser): mark Meta and Title services as tree shakable providers (#24815)

This lets services that use Meta and Title services to be tree shakable and provided in root.

PR Close #24815

packages/platform-browser/src/browser.ts

@@ -89,8 +89,6 @@ export const BROWSER_MODULE_PROVIDERS: StaticProvider[] = [
   {provide: Testability, useClass: Testability, deps: [NgZone]},
   {provide: EventManager, useClass: EventManager, deps: [EVENT_MANAGER_PLUGINS, NgZone]},
   ELEMENT_PROBE_PROVIDERS,
-  {provide: Meta, useClass: Meta, deps: [DOCUMENT]},
-  {provide: Title, useClass: Title, deps: [DOCUMENT]},
 ];
 
 /**

packages/platform-browser/src/browser/meta.ts

@@ -34,7 +34,7 @@ export type MetaDefinition = {
  *
  * @experimental
  */
-@Injectable()
+@Injectable({providedIn: 'root'})
 export class Meta {
   private _dom: DomAdapter;
   constructor(@Inject(DOCUMENT) private _doc: any) { this._dom = getDOM(); }

packages/platform-browser/src/browser/title.ts

@@ -22,7 +22,7 @@ import {DOCUMENT} from '../dom/dom_tokens';
  *
  * @experimental
  */
-@Injectable()
+@Injectable({providedIn: 'root'})
 export class Title {
   constructor(@Inject(DOCUMENT) private _doc: any) {}
   /**