refactor(forms): remove useless imports

Remove useless imports and change `bindings` to `providers` inside
`@Component` and `@Directive`.

Closes #7904

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

@@ -25,7 +25,7 @@ export const DEFAULT_VALUE_ACCESSOR: any = /*@ts2dart_const*/
   // https://github.com/angular/angular/issues/3011 is implemented
   // selector: '[ngControl],[ngModel],[ngFormControl]',
   host: {'(input)': 'onChange($event.target.value)', '(blur)': 'onTouched()'},
-  bindings: [DEFAULT_VALUE_ACCESSOR]
+  providers: [DEFAULT_VALUE_ACCESSOR]
 })
 export class DefaultValueAccessor implements ControlValueAccessor {
   onChange = (_: any) => {};

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

@@ -90,7 +90,7 @@ export const controlNameBinding: any =
  */
 @Directive({
   selector: '[ngControl]',
-  bindings: [controlNameBinding],
+  providers: [controlNameBinding],
   inputs: ['name: ngControl', 'model: ngModel'],
   outputs: ['update: ngModelChange'],
   exportAs: 'ngForm'

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

@@ -78,7 +78,7 @@ export const formDirectiveProvider: any =
  */
 @Directive({
   selector: 'form:not([ngNoForm]):not([ngFormModel]),ngForm,[ngForm]',
-  bindings: [formDirectiveProvider],
+  providers: [formDirectiveProvider],
   host: {
     '(submit)': 'onSubmit()',
   },

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

@@ -79,7 +79,7 @@ export const formControlBinding: any =
  */
 @Directive({
   selector: '[ngFormControl]',
-  bindings: [formControlBinding],
+  providers: [formControlBinding],
   inputs: ['form: ngFormControl', 'model: ngModel'],
   outputs: ['update: ngModelChange'],
   exportAs: 'ngForm'

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

@@ -99,7 +99,7 @@ export const formDirectiveProvider: any =
  */
 @Directive({
   selector: '[ngFormModel]',
-  bindings: [formDirectiveProvider],
+  providers: [formDirectiveProvider],
   inputs: ['form: ngFormModel'],
   host: {'(submit)': 'onSubmit()'},
   outputs: ['ngSubmit'],

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

@@ -50,7 +50,7 @@ export const formControlBinding: any =
  */
 @Directive({
   selector: '[ngModel]:not([ngControl]):not([ngFormControl])',
-  bindings: [formControlBinding],
+  providers: [formControlBinding],
   inputs: ['model: ngModel'],
   outputs: ['update: ngModelChange'],
   exportAs: 'ngForm'

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

@@ -25,7 +25,7 @@ export const NUMBER_VALUE_ACCESSOR: any = /*@ts2dart_const*/ /*@ts2dart_Provider
     '(input)': 'onChange($event.target.value)',
     '(blur)': 'onTouched()'
   },
-  bindings: [NUMBER_VALUE_ACCESSOR]
+  providers: [NUMBER_VALUE_ACCESSOR]
 })
 export class NumberValueAccessor implements ControlValueAccessor {
   onChange = (_: any) => {};

modules/@angular/common/src/forms/validators.ts

@@ -1,5 +1,4 @@
 import {OpaqueToken} from '@angular/core';
-
 import {isBlank, isPresent, isString} from '../../src/facade/lang';
 import {PromiseWrapper} from '../../src/facade/promise';
 import {ObservableWrapper} from '../../src/facade/async';