Enable rar, tar, tar.gz and tar.bz2 archive support in CrOS file manager.

chrome/browser/resources/file_manager/js/file_manager.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.
 
 // Setting the src of an img to an empty string can crash the browser, so we
 // use an empty 1x1 gif instead.
 const EMPTY_IMAGE_URI = 'data:image/gif;base64,'
         + 'R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw%3D%3D';
 
 /**
@@ skipping 76 matching lines @@
    * thumbnail in the bottom panel (in pixels).
    */
   const IMAGE_HOVER_PREVIEW_SIZE = 200;
 
   /**
    * Translated strings.
    */
   var localStrings;
 
   /**
-   * Regexp for archive files. Used to show mount-archive task.
-   */
-  const ARCHIVES_REGEXP = /.zip$/;
-
-  /**
    * Item for the Grid View.
    * @constructor
    */
   function GridItem(fileManager, entry) {
     var li = fileManager.document_.createElement('li');
     GridItem.decorate(li, fileManager, entry);
     return li;
   }
 
   GridItem.prototype = {
@@ skipping 3693 matching lines @@
           });
       }, onError);
 
       function onError(err) {
         console.log('Error while checking free space: ' + err);
         setTimeout(doCheck, 1000 * 60);
       }
     }
   }
 })();