VideoPlayer: Use system header.

ui/file_manager/video_player/js/background.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.
 
 /**
  * Icon of the video player.
  * TODO(yoshiki): Consider providing an exact size icon, instead of relying
  * on downsampling by ash.
  *
  * @type {string}
  * @const
  */
 var ICON_IMAGE = 'images/icon/video-player-64.png';
 
 /**
  * Configuration of the video player panel.
  * @type {Object}
  */
 var windowCreateOptions = {
-  frame: 'none',
+  frame: {
+    color: '#fafafa'
+  },
   minWidth: 480,
   minHeight: 270
 };
 
 /**
  * Backgound object. This is necessary for AppWindowWrapper.
  * @type {BackgroundBase}
  */
 var background = new BackgroundBase();
 
@@ skipping 53 matching lines @@
     appWindow.focus();
 
     return windowId;
   }.wrap()).catch(function(error) {
     console.error('Launch failed' + error.stack || error);
     return Promise.reject(error);
   }.wrap());
 }
 
 background.setLaunchHandler(openVideoPlayerWindow);