message: refactor(common): remove `XhrFactory` re-export from `@angular/common/http`
  This was only done temporary to allow migration in Google3. The removal breaking change message has already been included in
  PR Close
diff: * found in the LICENSE file at https://angular.io/license
  */
  -// TODO(alan-agius4): remove this export once migration has been done in Google3. (Should happen
  -// prior to V12 RC).
  -export {XhrFactory} from '@angular/common';
  -
  export {HttpBackend, HttpHandler} from './src/backend';
  export {HttpClient} from './src/client';
  export {HttpContext, HttpContextToken} from './src/context';
  