refactor(multiple): remove PlatformModule usages

The `PlatformModule` is a noop so we don't need to import it.

Author: crisbeto

src/cdk/a11y/a11y-module.ts

@@ -7,15 +7,14 @@
  */
 
 import {ObserversModule} from '@angular/cdk/observers';
-import {PlatformModule} from '@angular/cdk/platform';
 import {NgModule} from '@angular/core';
 import {CdkMonitorFocus} from './focus-monitor/focus-monitor';
 import {CdkTrapFocus} from './focus-trap/focus-trap';
 import {HighContrastModeDetector} from './high-contrast-mode/high-contrast-mode-detector';
 import {CdkAriaLive} from './live-announcer/live-announcer';
 
 @NgModule({
-  imports: [PlatformModule, ObserversModule],
+  imports: [ObserversModule],
   declarations: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],
   exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],
 })

src/cdk/scrolling/scrolling-module.ts

@@ -7,7 +7,6 @@
  */
 
 import {BidiModule} from '@angular/cdk/bidi';
-import {PlatformModule} from '@angular/cdk/platform';
 import {NgModule} from '@angular/core';
 import {CdkFixedSizeVirtualScroll} from './fixed-size-virtual-scroll';
 import {CdkScrollable} from './scrollable';
@@ -24,7 +23,7 @@ export class CdkScrollableModule {}
  * @docs-primary-export
  */
 @NgModule({
-  imports: [BidiModule, PlatformModule, CdkScrollableModule],
+  imports: [BidiModule, CdkScrollableModule],
   exports: [
     BidiModule,
     CdkScrollableModule,

src/cdk/text-field/text-field-module.ts

@@ -6,14 +6,12 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {PlatformModule} from '@angular/cdk/platform';
 import {NgModule} from '@angular/core';
 import {CdkAutofill} from './autofill';
 import {CdkTextareaAutosize} from './autosize';
 
 @NgModule({
   declarations: [CdkAutofill, CdkTextareaAutosize],
-  imports: [PlatformModule],
   exports: [CdkAutofill, CdkTextareaAutosize],
 })
 export class TextFieldModule {}

src/components-examples/cdk/platform/index.ts

@@ -1,4 +1,3 @@
-import {PlatformModule} from '@angular/cdk/platform';
 import {NgModule} from '@angular/core';
 import {CdkPlatformOverviewExample} from './cdk-platform-overview/cdk-platform-overview-example';
 
@@ -7,7 +6,6 @@ export {CdkPlatformOverviewExample};
 const EXAMPLES = [CdkPlatformOverviewExample];
 
 @NgModule({
-  imports: [PlatformModule],
   declarations: EXAMPLES,
   exports: EXAMPLES,
 })

src/dev-app/platform/platform-demo-module.ts

@@ -6,18 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {PlatformModule} from '@angular/cdk/platform';
 import {CommonModule} from '@angular/common';
 import {NgModule} from '@angular/core';
 import {RouterModule} from '@angular/router';
 import {PlatformDemo} from './platform-demo';
 
 @NgModule({
-  imports: [
-    CommonModule,
-    PlatformModule,
-    RouterModule.forChild([{path: '', component: PlatformDemo}]),
-  ],
+  imports: [CommonModule, RouterModule.forChild([{path: '', component: PlatformDemo}])],
   declarations: [PlatformDemo],
 })
 export class PlatformDemoModule {}

src/material/core/datetime/index.ts

@@ -6,7 +6,6 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {PlatformModule} from '@angular/cdk/platform';
 import {NgModule} from '@angular/core';
 import {DateAdapter} from './date-adapter';
 import {MAT_DATE_FORMATS} from './date-formats';
@@ -19,7 +18,6 @@ export * from './native-date-adapter';
 export * from './native-date-formats';
 
 @NgModule({
-  imports: [PlatformModule],
   providers: [{provide: DateAdapter, useClass: NativeDateAdapter}],
 })
 export class NativeDateModule {}

src/material/core/ripple/index.ts

@@ -7,7 +7,6 @@
  */
 
 import {NgModule} from '@angular/core';
-import {PlatformModule} from '@angular/cdk/platform';
 import {MatCommonModule} from '../common-behaviors/common-module';
 import {MatRipple} from './ripple';
 
@@ -16,7 +15,7 @@ export * from './ripple-ref';
 export * from './ripple-renderer';
 
 @NgModule({
-  imports: [MatCommonModule, PlatformModule],
+  imports: [MatCommonModule],
   exports: [MatRipple, MatCommonModule],
   declarations: [MatRipple],
 })

src/material/sidenav/sidenav-module.ts

@@ -5,7 +5,6 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {PlatformModule} from '@angular/cdk/platform';
 import {CdkScrollableModule} from '@angular/cdk/scrolling';
 import {CommonModule} from '@angular/common';
 import {NgModule} from '@angular/core';
@@ -14,7 +13,7 @@ import {MatDrawer, MatDrawerContainer, MatDrawerContent} from './drawer';
 import {MatSidenav, MatSidenavContainer, MatSidenavContent} from './sidenav';
 
 @NgModule({
-  imports: [CommonModule, MatCommonModule, PlatformModule, CdkScrollableModule],
+  imports: [CommonModule, MatCommonModule, CdkScrollableModule],
   exports: [
     CdkScrollableModule,
     MatCommonModule,