[FileBrowser] Fixed gdata space info in nested folders.

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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 4128 matching lines @@
 
   /**
    * Listener invoked on gdata menu show event, to update gdata free/total
    * space info in opened menu.
    * @private
    */
   FileManager.prototype.onGDataMenuShow_ = function() {
     this.updateCommands_();
     this.gdataSpaceInfoBar_.setAttribute('pending', '');
     chrome.fileBrowserPrivate.getSizeStats(
-        this.directoryModel_.getCurrentDirEntry().toURL(), function(result) {
+        this.directoryModel_.getCurrentRootUrl(), function(result) {
           if (!chrome.extension.lastError) {
             this.gdataSpaceInfoBar_.removeAttribute('pending');
 
             var sizeInGb = util.bytesToSi(result.remainingSizeKB * 1024);
             this.gdataSpaceInfoLabel_.textContent =
                 strf('GDATA_SPACE_AVAILABLE', sizeInGb);
 
             var usedSpace = result.totalSizeKB - result.remainingSizeKB;
 
             this.gdataSpaceInfoBar_.style.display = '';
@@ skipping 20 matching lines @@
     }
 
     var defaultActionSeparator =
         this.dialogDom_.querySelector('#default-action-separator');
 
     this.defaultActionMenuItem_.hidden = !taskItem;
     defaultActionSeparator.hidden = !taskItem;
   }
 })();