fix: makes NgModel work in strict mode

Author: mhevery

modules/angular2/src/forms/directives/ng_model.ts

@@ -38,30 +38,25 @@ const formControlBinding = CONST_EXPR(new Binding(NgControl, {toAlias: forwardRe
  exportAs: 'form'
 })
 export class NgModel extends NgControl {
- control: Control;
- ngModel: EventEmitter;
+ _control = new Control("");
+ _added = false;
+ ngModel = new EventEmitter();
  model: any;
- _added: boolean;
-
- constructor() {
- super();
- this.control = new Control("");
- this.ngModel = new EventEmitter();
- this._added = false;
- }
 
  onChange(c) {
  if (!this._added) {
- setUpControl(this.control, this);
+ setUpControl(this._control, this);
  this.control.updateValidity();
  this._added = true;
  };
 
  if (StringMapWrapper.contains(c, "model")) {
- this.control.updateValue(this.model);
+ this._control.updateValue(this.model);
  }
  }
 
+ get control() { return this._control; }
+
  get path(): List<string> { return []; }
 
  viewToModelUpdate(newValue: any): void { ObservableWrapper.callNext(this.ngModel, newValue); }