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/core/src/animation/view_animation_map.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ListWrapper, StringMapWrapper} from '../facade/collection';
+import {StringMapWrapper} from '../facade/collection';
 import {isPresent} from '../facade/lang';
 
 import {AnimationPlayer} from './animation_player';