[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/src/models/ModelCacheService.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*/
 
 define([], function () {
-    'use strict';
 
     /**
      * Provides a cache for domain object models which exist in memory,