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/examples/core/di/ts/contentChild/content_child_howto.ts

@@ -7,7 +7,7 @@
  */
 
 // #docregion HowTo
-import {AfterContentInit, Component, ContentChild, Directive, QueryList} from '@angular/core';
+import {AfterContentInit, ContentChild, Directive} from '@angular/core';
 
 @Directive({selector: 'child-directive'})
 class ChildDirective {

modules/@angular/examples/core/di/ts/contentChildren/content_children_howto.ts

@@ -7,7 +7,7 @@
  */
 
 // #docregion HowTo
-import {AfterContentInit, Component, ContentChildren, Directive, QueryList} from '@angular/core';
+import {AfterContentInit, ContentChildren, Directive, QueryList} from '@angular/core';
 
 @Directive({selector: 'child-directive'})
 class ChildDirective {

modules/@angular/examples/core/di/ts/forward_ref/forward_ref_spec.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ForwardRefFn, Inject, ReflectiveInjector, forwardRef, resolveForwardRef} from '@angular/core';
+import {Inject, ReflectiveInjector, forwardRef, resolveForwardRef} from '@angular/core';
 
 export function main() {
   describe('forwardRef examples', () => {

modules/@angular/examples/core/di/ts/provider_spec.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Inject, Injectable, OpaqueToken, Optional, ReflectiveInjector, ValueProvider} from '@angular/core';
+import {Inject, Injectable, OpaqueToken, Optional, ReflectiveInjector} from '@angular/core';
 
 export function main() {
   describe('Provider examples', () => {

modules/@angular/examples/core/di/ts/viewChild/view_child_example.ts

@@ -7,7 +7,7 @@
  */
 
 // #docregion Component
-import {AfterViewInit, Component, Directive, Input, ViewChild} from '@angular/core';
+import {Component, Directive, Input, ViewChild} from '@angular/core';
 
 @Directive({selector: 'pane'})
 export class Pane {

modules/@angular/examples/core/di/ts/viewChild/view_child_howto.ts

@@ -7,7 +7,7 @@
  */
 
 // #docregion HowTo
-import {AfterViewInit, Component, Directive, QueryList, ViewChild} from '@angular/core';
+import {AfterViewInit, Component, Directive, ViewChild} from '@angular/core';
 
 @Directive({selector: 'child-directive'})
 class ChildDirective {

modules/@angular/examples/core/ts/metadata/lifecycle_hooks_spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {AfterContentChecked, AfterContentInit, AfterViewChecked, AfterViewInit, Component, DoCheck, Input, OnChanges, OnDestroy, OnInit, SimpleChanges, Type} from '@angular/core';
-import {ComponentFixture, TestBed} from '@angular/core/testing';
+import {TestBed} from '@angular/core/testing';
 
 export function main() {
   describe('lifecycle hooks examples', () => {

modules/@angular/examples/core/ts/platform/platform.ts

@@ -6,8 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Component, ReflectiveInjector, createPlatformFactory} from '@angular/core';
-import {BrowserModule} from '@angular/platform-browser';
+import {Component, createPlatformFactory} from '@angular/core';
 import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
 
 // #docregion longform