Gallery.app: Don't dispatch an event to update when renaming is not done.

ui/file_manager/gallery/js/gallery_item.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.
 
 'use strict';
 
 /**
  * Object representing an image item (a photo).
  *
  * @param {FileEntry} entry Image entry.
@@ skipping 237 matching lines @@
     saveToDir(overrideDir);
   } else {
     this.entry_.getParent(saveToDir, onError);
   }
 };
 
 /**
  * Renames the item.
  *
  * @param {string} displayName New display name (without the extension).
- * @return {Promise} Promise fulfilled after renaming, or rejected with
- *     GalleryRenameError.
+ * @return {Promise} Promise fulfilled with when renaming completes, or rejected
+ *     with the error message.
  */
 Gallery.Item.prototype.rename = function(displayName) {
   var newFileName = this.entry_.name.replace(
       ImageUtil.getDisplayNameFromName(this.entry_.name), displayName);
 
   if (newFileName === this.entry_.name)
-    return Promise.resolve();
+    return Promise.reject('NOT_CHANGED');
 
   if (/^\s*$/.test(displayName))
     return Promise.reject(str('ERROR_WHITESPACE_NAME'));
 
   var parentDirectoryPromise = new Promise(
       this.entry_.getParent.bind(this.entry_));
   return parentDirectoryPromise.then(function(parentDirectory) {
     var nameValidatingPromise =
         util.validateFileName(parentDirectory, newFileName, true);
     return nameValidatingPromise.then(function() {
       var existingFilePromise = new Promise(parentDirectory.getFile.bind(
           parentDirectory, newFileName, {create: false, exclusive: false}));
       return existingFilePromise.then(function() {
         return Promise.reject(str('GALLERY_FILE_EXISTS'));
       }, function() {
         return new Promise(
             this.entry_.moveTo.bind(this.entry_, parentDirectory, newFileName));
       }.bind(this));
     }.bind(this));
   }.bind(this)).then(function(entry) {
     this.entry_ = entry;
   }.bind(this));
 };