Move FileCopyManager to background page.

chrome/browser/resources/file_manager/js/photo/photo_import.js

 // Copyright (c) 2012 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.
 
 document.addEventListener('DOMContentLoaded', function() {
   PhotoImport.load();
 });
 
 /**
  * The main Photo App object.
  * @param {HTMLElement} dom Container.
  * @param {FileSystem} filesystem Local file system.
  * @param {Object} params Parameters.
  * @constructor
  */
 function PhotoImport(dom, filesystem, params) {
   this.filesystem_ = filesystem;
   this.dom_ = dom;
   this.document_ = this.dom_.ownerDocument;
   this.metadataCache_ = params.metadataCache;
   this.volumeManager_ = new VolumeManager();
-  this.copyManager_ = new FileCopyManager(this.filesystem_.root);
+  this.copyManager_ = FileCopyManagerWrapper.getInstance(this.filesystem_.root);
   this.mediaFilesList_ = null;
   this.albums_ = null;
   this.albumsDir_ = null;
 
   this.initDom_();
   this.initAlbums_();
   this.loadSource_(params.source);
 }
 
 PhotoImport.prototype = { __proto__: cr.EventTarget.prototype };
@@ skipping 519 matching lines @@
 
 /** @inheritDoc */
 GridSelectionController.prototype.getLastIndex = function() {
   var dm = this.grid_.dataModel;
   for (var index = dm.length - 1; index >= 0; index--) {
     if (dm.item(index).type == 'entry')
       return index;
   }
   return -1;
 };