message: test(aio): use MockLogger in AppComponent tests
  This component sends a lot of messages to the console, which makes the
  test run less easy to follow.
diff: @@ -11,6 +11,8 @@ import { AutoScrollService } from 'app/shared/auto-scroll.service';
  import { MockSearchService } from 'testing/search.service';
  import { LocationService } from 'app/shared/location.service';
  import { MockLocationService } from 'testing/location.service';
  +import { Logger } from 'app/shared/logger.service';
  +import { MockLogger } from 'testing/logger.service';
  describe('AppComponent', () => {
  let component: AppComponent;
  @@ -24,7 +26,8 @@ describe('AppComponent', () => {
  { provide: APP_BASE_HREF, useValue: '/' },
  { provide: SearchService, useClass: MockSearchService },
  { provide: GaService, useClass: TestGaService },
  - { provide: LocationService, useFactory: () => new MockLocationService(initialUrl) }
  + { provide: LocationService, useFactory: () => new MockLocationService(initialUrl) },
  + { provide: Logger, useClass: MockLogger }
  ]
  });
  TestBed.compileComponents();
  