[Photo Editor] Fixed an exception when renaming an edited image.

chrome/browser/resources/file_manager/js/image_editor/gallery.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.
 
 /*
  * Base class that Ribbon uses to display photos.
  */
 
 function RibbonClient() {}
 
@@ skipping 526 matching lines @@
 
   function onSuccess(entry) {
     item.setUrl(entry.toURL());
     self.updateFilename_();
   }
 
   function doRename() {
     if (self.imageChanges_ > 0) {
       // Use this name in the next save operation.
       item.setNameForSaving(newName);
-      this.filenameSpacer_.removeAttribute('overwrite');
+      self.filenameSpacer_.removeAttribute('overwrite');
       self.updateFilename_();
     } else {
       // Rename file in place.
       dir.getFile(
           ImageUtil.getFullNameFromUrl(item.getUrl()),
           {create: false},
           function(entry) { entry.moveTo(dir, newName, onSuccess, onError); },
           onError);
     }
   }
@@ skipping 924 matching lines @@
 ShareMode.prototype.setUp = function() {
   ImageEditor.Mode.prototype.setUp.apply(this, arguments);
   ImageUtil.setAttribute(this.menu_, 'hidden', false);
   ImageUtil.setAttribute(this.button_, 'pressed', false);
 };
 
 ShareMode.prototype.cleanUpUI = function() {
   ImageEditor.Mode.prototype.cleanUpUI.apply(this, arguments);
   ImageUtil.setAttribute(this.menu_, 'hidden', true);
 };