[Build] Remove use strict, global

Remove usages of use strict and global declarations that are
no longer necessary with JSHint configuration, from files
added/changed since #724

platform/core/test/models/ModelCacheServiceSpec.js

@@ -19,10 +19,8 @@
  * this source code distribution or the Licensing information page available
  * at runtime from the About dialog for additional information.
  *****************************************************************************/
-/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine*/
 
 define(['../../src/models/ModelCacheService'], function (ModelCacheService) {
-    'use strict';
     describe("ModelCacheService", function () {
         var testIds,
             testModels,