chore(lint): remove unused imports (#11923)

This was done automatically by tslint, which can now fix issues it finds.
The fixer is still pending in PR https://github.com/palantir/tslint/pull/1568
Also I have a local bugfix for https://github.com/palantir/tslint/issues/1569
which causes too many imports to be deleted.

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

@@ -9,7 +9,6 @@
 import {Directive, ElementRef, Injectable, Injector, Input, OnDestroy, OnInit, Renderer, forwardRef} from '@angular/core';
 
 import {ListWrapper} from '../facade/collection';
-import {isPresent} from '../facade/lang';
 
 import {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';
 import {NgControl} from './ng_control';

modules/@angular/forms/test/directives_spec.ts

@@ -8,7 +8,7 @@
 
 import {SimpleChange} from '@angular/core/src/change_detection';
 import {fakeAsync, flushMicrotasks, tick} from '@angular/core/testing';
-import {Log, afterEach, beforeEach, ddescribe, describe, expect, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
+import {beforeEach, describe, expect, it} from '@angular/core/testing/testing_internal';
 import {CheckboxControlValueAccessor, ControlValueAccessor, DefaultValueAccessor, FormArray, FormArrayName, FormControl, FormControlDirective, FormControlName, FormGroup, FormGroupDirective, FormGroupName, NgControl, NgForm, NgModel, NgModelGroup, SelectControlValueAccessor, SelectMultipleControlValueAccessor, Validator, Validators} from '@angular/forms';
 import {composeValidators, selectValueAccessor} from '@angular/forms/src/directives/shared';
 

modules/@angular/forms/test/form_array_spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {fakeAsync, tick} from '@angular/core/testing';
-import {AsyncTestCompleter, beforeEach, ddescribe, describe, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
+import {AsyncTestCompleter, beforeEach, describe, inject, it} from '@angular/core/testing/testing_internal';
 import {AbstractControl, FormArray, FormControl, FormGroup} from '@angular/forms';
 
 import {isPresent} from '../src/facade/lang';

modules/@angular/forms/test/form_builder_spec.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {afterEach, beforeEach, ddescribe, describe, expect, iit, it, xit} from '@angular/core/testing/testing_internal';
+import {beforeEach, describe, expect, it} from '@angular/core/testing/testing_internal';
 import {FormBuilder} from '@angular/forms';
 
 export function main() {

modules/@angular/forms/test/form_control_spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {fakeAsync, tick} from '@angular/core/testing';
-import {AsyncTestCompleter, beforeEach, ddescribe, describe, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
+import {AsyncTestCompleter, beforeEach, describe, inject, it} from '@angular/core/testing/testing_internal';
 import {FormControl, FormGroup, Validators} from '@angular/forms';
 
 import {EventEmitter} from '../src/facade/async';

modules/@angular/forms/test/form_group_spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {async, fakeAsync, tick} from '@angular/core/testing';
-import {AsyncTestCompleter, beforeEach, ddescribe, describe, iit, inject, it, xit} from '@angular/core/testing/testing_internal';
+import {AsyncTestCompleter, beforeEach, describe, inject, it} from '@angular/core/testing/testing_internal';
 import {AbstractControl, FormControl, FormGroup, Validators} from '@angular/forms';
 
 import {EventEmitter} from '../src/facade/async';

modules/@angular/forms/test/spies.ts

@@ -7,7 +7,7 @@
  */
 
 import {ChangeDetectorRef} from '@angular/core/src/change_detection/change_detector_ref';
-import {SpyObject, proxy} from '@angular/core/testing/testing_internal';
+import {SpyObject} from '@angular/core/testing/testing_internal';
 
 export class SpyChangeDetectorRef extends SpyObject {
   constructor() {

modules/@angular/forms/test/validators_spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {fakeAsync, tick} from '@angular/core/testing';
-import {afterEach, beforeEach, ddescribe, describe, expect, iit, it, xit} from '@angular/core/testing/testing_internal';
+import {describe, expect, it} from '@angular/core/testing/testing_internal';
 import {AbstractControl, FormControl, Validators} from '@angular/forms';
 import {Observable} from 'rxjs/Observable';