Gallery.app: Add empty place holders for new separated Gallery app.

chrome/browser/resources/gallery/js/gallery_scripts.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The include directives are put into Javascript-style comments to prevent
 // parsing errors in non-flattened mode. The flattener still sees them.
 // Note that this makes the flattener to comment out the first line of the
 // included file but that's all right since any javascript file should start
 // with a copyright comment anyway.
 
 //<include src="error_util.js"/>
 
 //<include src="../../../../../ui/webui/resources/js/cr.js"/>
 //<include src="../../../../../ui/webui/resources/js/load_time_data.js"/>
 
 (function() {
 'use strict';
 
-//<include src="../../file_manager/common/js/util.js"/>
-//<include src="../../file_manager/foreground/js/media/media_controls.js"/>
-//<include src="../../file_manager/foreground/js/media/util.js"/>
-
-//<include src="video_player.js"/>
-
-window.unload = unload;
-
+//<include src="gallery.js"/>
 })();