Use copies of canned browsing data helpers to populate the cookies tree model.

chrome/browser/browsing_data_indexed_db_helper.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_BROWSING_DATA_INDEXED_DB_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_INDEXED_DB_HELPER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 67 matching lines @@
 };
 
 // This class is an implementation of BrowsingDataIndexedDBHelper that does
 // not fetch its information from the indexed database tracker, but gets them
 // passed as a parameter.
 class CannedBrowsingDataIndexedDBHelper
     : public BrowsingDataIndexedDBHelper {
  public:
   explicit CannedBrowsingDataIndexedDBHelper(Profile* profile);
 
+  // Return a copy of the IndexedDB helper. Only one consumer can use the
+  // StartFetching method at a time, so we need to create a copy of the helper
+  // everytime we instantiate a cookies tree model for it.
+  CannedBrowsingDataIndexedDBHelper* Clone();
+
   // Add a indexed database to the set of canned indexed databases that is
   // returned by this helper.
   void AddIndexedDB(const GURL& origin,
                     const string16& description);
 
   // Clear the list of canned indexed databases.
   void Reset();
 
   // True if no indexed databases are currently stored.
   bool empty() const;
@@ skipping 39 matching lines @@
   // Indicates whether or not we're currently fetching information:
   // it's true when StartFetching() is called in the UI thread, and it's reset
   // after we notified the callback in the UI thread.
   // This only mutates on the UI thread.
   bool is_fetching_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataIndexedDBHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_INDEXED_DB_HELPER_H_