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

chrome/browser/browsing_data_database_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_DATABASE_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_DATABASE_HELPER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 91 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(BrowsingDataDatabaseHelper);
 };
 
 // This class is a thin wrapper around BrowsingDataDatabaseHelper that does not
 // fetch its information from the database tracker, but gets them passed as
 // a parameter during construction.
 class CannedBrowsingDataDatabaseHelper : public BrowsingDataDatabaseHelper {
  public:
   explicit CannedBrowsingDataDatabaseHelper(Profile* profile);
 
+  // Return a copy of the database 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.
+  CannedBrowsingDataDatabaseHelper* Clone();
+
   // Add a database to the set of canned databases that is returned by this
   // helper.
   void AddDatabase(const GURL& origin,
                    const std::string& name,
                    const std::string& description);
 
   // Clear the list of canned databases.
   void Reset();
 
   // True if no databases are currently stored.
@@ skipping 21 matching lines @@
 
   // Converts the pending database info structs to database info structs.
   void ConvertInfoInWebKitThread();
 
   // Used to protect access to pending_database_info_.
   mutable base::Lock lock_;
 
   // This may mutate on WEBKIT and UI threads.
   std::vector<PendingDatabaseInfo> pending_database_info_;
 
+  Profile* profile_;
+
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataDatabaseHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_DATABASE_HELPER_H_