anchor.diff:  
     final Element _elementRef;
     final DomService _domService;
  -  final ManagedZone _managedZone;
  +  final NgZone _ngZone;
   
     // This controls when the calendar is created.
     // By default, this is null, and the calendar will be created shortly
  
positive.code: import 'package:angular_components/model/date/date.dart';
  import 'package:angular_components/model/date/date_formatter.dart';
  import 'package:angular_components/model/observable/observable.dart';
  import 'package:angular_components/utils/angular/managed_zone/interface.dart';
  import 'package:angular_components/utils/angular/scroll_host/angular_2.dart';
  import 'package:angular_components/utils/browser/dom_service/dom_service.dart';
  import 'package:angular_components/utils/showhide/showhide.dart';
  
negative.code:   DateRangeEditorComponent(
        this._elementRef,
        this._domService,
        this._ngZone,
        @Optional() DateRangeEditorHost editorHost,
        @Optional() @Inject(datepickerClock) Clock clock,
        Clock legacyClock) {
  