message: refactor(core): remove an unused import in application_ref
diff: @@ -14,7 +14,6 @@ import {isPromise} from '../src/util/lang';
  import {ApplicationInitStatus} from './application_init';
  import {APP_BOOTSTRAP_LISTENER, PLATFORM_INITIALIZER} from './application_tokens';
  -import {ChangeDetectorRef} from './change_detection/change_detector_ref';
  import {Console} from './console';
  import {Injectable, InjectionToken, Injector, Optional, Provider, ReflectiveInjector} from './di';
  import {CompilerFactory, CompilerOptions} from './linker/compiler';
  