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

chrome/browser/browsing_data_appcache_helper.h

 // Copyright (c) 2010 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_APPCACHE_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_APPCACHE_HELPER_H_
 #pragma once
 
 #include "base/scoped_ptr.h"
 #include "base/task.h"
@@ skipping 38 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(BrowsingDataAppCacheHelper);
 };
 
 // This class is a thin wrapper around BrowsingDataAppCacheHelper that does not
 // fetch its information from the appcache service, but gets them passed as
 // a parameter during construction.
 class CannedBrowsingDataAppCacheHelper : public BrowsingDataAppCacheHelper {
  public:
   explicit CannedBrowsingDataAppCacheHelper(Profile* profile);
 
+  // Return a copy of the appcache 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.
+  CannedBrowsingDataAppCacheHelper* Clone();
+
   // Add an appcache to the set of canned caches that is returned by this
   // helper.
   void AddAppCache(const GURL& manifest_url);
 
   // Clears the list of canned caches.
   void Reset();
 
   // True if no appcaches are currently stored.
   bool empty() const;
 
   // BrowsingDataAppCacheHelper methods.
   virtual void StartFetching(Callback0::Type* completion_callback);
   virtual void CancelNotification() {}
 
  private:
   virtual ~CannedBrowsingDataAppCacheHelper();
 
+  Profile* profile_;
+
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataAppCacheHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_APPCACHE_HELPER_H_