chore(tabs): remove tabs demo module (#1637)

Author: jelbourn

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

@@ -32,7 +32,7 @@ import {SidenavDemo} from './sidenav/sidenav-demo';
 import {SnackBarDemo} from './snack-bar/snack-bar-demo';
 import {PortalDemo, ScienceJoke} from './portal/portal-demo';
 import {MenuDemo} from './menu/menu-demo';
-import {TabsDemoModule} from './tabs/tabs-demo.module';
+import {TabsDemo, SunnyTabContent, RainyTabContent, FoggyTabContent} from './tabs/tabs-demo';
 
 @NgModule({
   imports: [
@@ -41,7 +41,6 @@ import {TabsDemoModule} from './tabs/tabs-demo.module';
     HttpModule,
     RouterModule.forRoot(DEMO_APP_ROUTES),
     MaterialModule.forRoot(),
-    TabsDemoModule,
   ],
   declarations: [
     BaselineDemo,
@@ -77,6 +76,10 @@ import {TabsDemoModule} from './tabs/tabs-demo.module';
     SpagettiPanel,
     ToolbarDemo,
     TooltipDemo,
+    TabsDemo,
+    SunnyTabContent,
+    RainyTabContent,
+    FoggyTabContent,
   ],
   entryComponents: [
     DemoApp,

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

@@ -36,7 +36,7 @@ export class TabsDemo {
     // This is not an ideal check and can be removed if routerLink exposes if it is active.
     // https://github.com/angular/angular/pull/12525
     this.activeLinkIndex =
-        this.tabLinks.findIndex(routedTab => router.url.indexOf(routedTab.link) != -1);
+        this.tabLinks.indexOf(this.tabLinks.find(tab => router.url.indexOf(tab.link) != -1));
   }
 }