chore: remove references to the web animations polyfill (#11179)

Gets rid of the Web animations polyfill from our demo apps, as well as from the docs. The polyfill is not longer required as of Angular 6.

guides/getting-started.md

@@ -48,10 +48,6 @@ npm install --save @angular/animations
 yarn add @angular/animations
 ```
 
-**Note:** `@angular/animations` uses the WebAnimation API that isn't supported by all browsers yet.
-If you want to support Material component animations in these browsers, you'll have to
-[include a polyfill](https://github.com/web-animations/web-animations-js).
-
 ```ts
 import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
 

package.json

@@ -131,7 +131,6 @@
     "tslint": "^5.9.1",
     "tsutils": "^2.6.0",
     "typescript": "2.7.x",
-    "uglify-js": "^2.8.14",
-    "web-animations-js": "^2.2.5"
+    "uglify-js": "^2.8.14"
   }
 }

src/demo-app/index.html

@@ -25,7 +25,6 @@
   <entry-app>Loading...</entry-app>
 
   <script src="node_modules/core-js/client/core.js"></script>
-  <script src="node_modules/web-animations-js/web-animations.min.js"></script>
   <script src="node_modules/systemjs/dist/system.src.js"></script>
   <script src="node_modules/zone.js/dist/zone.js"></script>
   <script src="node_modules/hammerjs/hammer.min.js"></script>

src/e2e-app/index.html

@@ -18,7 +18,6 @@
   <e2e-app>Loading...</e2e-app>
 
   <script src="node_modules/core-js/client/core.js"></script>
-  <script src="node_modules/web-animations-js/web-animations.min.js"></script>
   <script src="node_modules/systemjs/dist/system.src.js"></script>
   <script src="node_modules/zone.js/dist/zone.js"></script>
   <script src="node_modules/hammerjs/hammer.min.js"></script>

tools/gulp/tasks/development.ts

@@ -32,7 +32,6 @@ const appVendors = [
   'rxjs',
   'hammerjs',
   'core-js',
-  'web-animations-js',
   'moment',
   'tslib',
   '@webcomponents',