chore: remove change detection toggle from demo app (#6444)

Removes the toggle that changes the change detection in the demo app. It's not needed anymore since all components use OnPush.

Author: crisbeto

src/demo-app/demo-app/demo-app.html

@@ -30,9 +30,6 @@
       <div class="demo-toolbar">
         <h1>Angular Material Demos</h1>
         <div>
-          <button md-button (click)="toggleChangeDetection()" title="Toggle change detection">
-            Change detection: {{changeDetectionStrategy}}
-          </button>
           <button md-icon-button (click)="toggleFullscreen()" title="Toggle fullscreen">
             <md-icon class="md-24">fullscreen</md-icon>
           </button>
@@ -44,14 +41,8 @@ <h1>Angular Material Demos</h1>
       </div>
     </md-toolbar>
 
-    <div #root="dir" dir="ltr" class="demo-content" [ngSwitch]="changeDetectionStrategy">
-      <div *ngSwitchDefault>
-        <router-outlet></router-outlet>
-      </div>
-
-      <demo-app-on-push *ngSwitchCase="'OnPush'">
-        <router-outlet></router-outlet>
-      </demo-app-on-push>
+    <div #root="dir" dir="ltr" class="demo-content">
+      <router-outlet></router-outlet>
     </div>
   </div>
 </md-sidenav-container>

src/demo-app/demo-app/demo-app.ts

@@ -2,13 +2,10 @@ import {
   Component,
   ViewEncapsulation,
   ElementRef,
-  ChangeDetectionStrategy,
   Renderer2,
 } from '@angular/core';
 import {OverlayContainer} from '@angular/material';
 
-const changeDetectionKey = 'mdDemoChangeDetection';
-
 /**
  * The entry app for demo site. Routes under `accessibility` will use AccessibilityDemo component,
  * while other demos will use `DemoApp` component. Since DemoApp and AccessibilityDemo use
@@ -35,15 +32,6 @@ export class EntryApp {}
 })
 export class Home {}
 
-@Component({
-  moduleId: module.id,
-  selector: 'demo-app-on-push',
-  template: '<ng-content></ng-content>',
-  changeDetection: ChangeDetectionStrategy.OnPush,
-  encapsulation: ViewEncapsulation.None,
-})
-export class DemoAppOnPush {}
-
 /**
  * DemoApp with toolbar and sidenav.
  */
@@ -56,7 +44,6 @@ export class DemoAppOnPush {}
 })
 export class DemoApp {
   dark = false;
-  changeDetectionStrategy: string;
   navItems = [
     {name: 'Autocomplete', route: '/autocomplete'},
     {name: 'Button', route: '/button'},
@@ -97,14 +84,7 @@ export class DemoApp {
   constructor(
     private _element: ElementRef,
     private _renderer: Renderer2,
-    private _overlayContainer: OverlayContainer) {
-    // Some browsers will throw when trying to access localStorage in incognito.
-    try {
-      this.changeDetectionStrategy = window.localStorage.getItem(changeDetectionKey) || 'Default';
-    } catch (error) {
-      console.error(error);
-    }
-  }
+    private _overlayContainer: OverlayContainer) {}
 
   toggleFullscreen() {
     let elem = this._element.nativeElement.querySelector('.demo-content');
@@ -119,17 +99,6 @@ export class DemoApp {
     }
   }
 
-  toggleChangeDetection() {
-    try {
-      this.changeDetectionStrategy = this.changeDetectionStrategy === 'Default' ?
-          'OnPush' : 'Default';
-      window.localStorage.setItem(changeDetectionKey, this.changeDetectionStrategy);
-      window.location.reload();
-    } catch (error) {
-      console.error(error);
-    }
-  }
-
   toggleTheme() {
     const darkThemeClass = 'unicorn-dark-theme';
 

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

@@ -2,7 +2,7 @@ import {NgModule} from '@angular/core';
 import {CommonModule} from '@angular/common';
 import {FormsModule, ReactiveFormsModule} from '@angular/forms';
 import {RouterModule} from '@angular/router';
-import {DemoApp, DemoAppOnPush, Home} from './demo-app';
+import {DemoApp, Home} from './demo-app';
 import {DEMO_APP_ROUTES} from './routes';
 import {ProgressBarDemo} from '../progress-bar/progress-bar-demo';
 import {ContentElementDialog, DialogDemo, IFrameDialog, JazzDialog} from '../dialog/dialog-demo';
@@ -65,7 +65,6 @@ import {TableHeaderDemo} from '../table/table-header-demo';
     CheckboxDemo,
     DatepickerDemo,
     DemoApp,
-    DemoAppOnPush,
     DialogDemo,
     GesturesDemo,
     GridListDemo,