style(Forms): remove unused imports

remove unused imports from the forms package

modules/@angular/common/src/forms/directives/checkbox_value_accessor.ts

@@ -1,4 +1,4 @@
-import {Directive, Renderer, ElementRef, Self, forwardRef, Provider} from '@angular/core';
+import {Directive, Renderer, ElementRef, forwardRef} from '@angular/core';
 import {NG_VALUE_ACCESSOR, ControlValueAccessor} from './control_value_accessor';
 
 export const CHECKBOX_VALUE_ACCESSOR: any = /*@ts2dart_const*/ {

modules/@angular/common/src/forms/directives/ng_control_name.ts

@@ -2,12 +2,10 @@ import {
   OnChanges,
   OnDestroy,
   SimpleChange,
-  Query,
   Directive,
   forwardRef,
   Host,
   SkipSelf,
-  Provider,
   Inject,
   Optional,
   Self

modules/@angular/common/src/forms/directives/ng_form.ts

@@ -1,9 +1,8 @@
-import {Directive, forwardRef, Provider, Optional, Inject, Self} from '@angular/core';
+import {Directive, forwardRef, Optional, Inject, Self} from '@angular/core';
 import {
   PromiseWrapper,
   ObservableWrapper,
-  EventEmitter,
-  PromiseCompleter
+  EventEmitter
 } from '../../../src/facade/async';
 import {ListWrapper} from '../../../src/facade/collection';
 import {isPresent} from '../../../src/facade/lang';

modules/@angular/common/src/forms/directives/ng_form_control.ts

@@ -1,10 +1,8 @@
 import {
   OnChanges,
   SimpleChange,
-  Query,
   Directive,
   forwardRef,
-  Provider,
   Inject,
   Optional,
   Self

modules/@angular/common/src/forms/directives/ng_form_model.ts

@@ -3,7 +3,6 @@ import {
   OnChanges,
   Directive,
   forwardRef,
-  Provider,
   Inject,
   Optional,
   Self

modules/@angular/common/src/forms/directives/ng_model.ts

@@ -3,7 +3,6 @@ import {
   SimpleChange,
   Directive,
   forwardRef,
-  Provider,
   Inject,
   Optional,
   Self

modules/@angular/common/src/forms/directives/number_value_accessor.ts

@@ -1,4 +1,4 @@
-import {Directive, ElementRef, Renderer, Self, forwardRef, Provider} from '@angular/core';
+import {Directive, ElementRef, Renderer, forwardRef} from '@angular/core';
 import {NumberWrapper} from '../../../src/facade/lang';
 import {NG_VALUE_ACCESSOR, ControlValueAccessor} from './control_value_accessor';
 

modules/@angular/common/src/forms/directives/radio_control_value_accessor.ts

@@ -3,7 +3,6 @@ import {
   ElementRef,
   Renderer,
   forwardRef,
-  Provider,
   Input,
   OnInit,
   OnDestroy,

modules/@angular/common/src/forms/directives/select_control_value_accessor.ts

@@ -2,7 +2,6 @@ import {
   Directive,
   Renderer,
   forwardRef,
-  Provider,
   ElementRef,
   Input,
   Host,