Fixed flickering "Computing selection" label.

chrome/browser/resources/file_manager/js/mock_chrome.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.
 
 function MockEventSource() {
   this.listeners_ = [];
 }
 
 /**
  * Add a listener.
@@ skipping 658 matching lines @@
           ' <a target=\'_blank\' href=\'$2\'>Learn More.</a>',
 
       DEFAULT_NEW_FOLDER_NAME: 'New Folder',
       MORE_FILES: 'Show all files',
 
       SELECT_FOLDER_TITLE: 'Select a folder to open',
       SELECT_OPEN_FILE_TITLE: 'Select a file to open',
       SELECT_OPEN_MULTI_FILE_TITLE: 'Select one or more files',
       SELECT_SAVEAS_FILE_TITLE: 'Save file as',
 
-      COMPUTING_SELECTION: 'Computing selection...',
       MANY_FILES_SELECTED: '$1 files selected',
       MANY_DIRECTORIES_SELECTED: '$1 folders selected',
       MANY_ENTRIES_SELECTED: '$1 items selected',
       CALCULATING_SIZE: 'Calculating size',
 
       DELETED_MESSAGE: 'Deleted $1',
       DELETED_MESSAGE_PLURAL: 'Deleted $1 items',
       UNDO_DELETE: 'Undo',
 
       UNKNOWN_FILESYSTEM_WARNING: 'This device cannot be opened because its' +
@@ skipping 183 matching lines @@
   playAudio: function(urls, position) {
     this.audioPlaylist_ = { items: urls, position: position };
     this.onPlaylistChanged.notify();
   },
 
   playVideo: function(url) {
     this.videoUrl_ = url;
     this.onVideoLaunched.notify();
   }
 };