remove unneeded imports

Author: Danny Blue

packages/angular-cli/blueprints/class/files/__path__/__name__.spec.ts

@@ -1,6 +1,3 @@
-/* tslint:disable:no-unused-variable */
-
-import { addProviders, async, inject } from '@angular/core/testing';
 import {<%= classifiedModuleName %>} from './<%= fileName %>';
 
 describe('<%= classifiedModuleName %>', () => {