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

chrome/browser/browsing_data_local_storage_helper.h

Index: chrome/browser/browsing_data_local_storage_helper.h
diff --git a/chrome/browser/browsing_data_local_storage_helper.h b/chrome/browser/browsing_data_local_storage_helper.h
index e1db472174cd69bd8fcbfe39c4a2c1dcb1d66411..80dbc0497a1b7e404d42b3a84f29531725e9cac6 100644
--- a/chrome/browser/browsing_data_local_storage_helper.h
+++ b/chrome/browser/browsing_data_local_storage_helper.h
@@ -110,6 +110,11 @@ class CannedBrowsingDataLocalStorageHelper
  public:
   explicit CannedBrowsingDataLocalStorageHelper(Profile* profile);
 
+  // Return a copy of the local storage 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.
+  CannedBrowsingDataLocalStorageHelper* Clone();
+
   // Add a local storage to the set of canned local storages that is returned
   // by this helper.
   void AddLocalStorage(const GURL& origin);
@@ -137,6 +142,8 @@ class CannedBrowsingDataLocalStorageHelper
   // May mutate on WEBKIT and UI threads.
   std::vector<GURL> pending_local_storage_info_;
 
+  Profile* profile_;
+
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataLocalStorageHelper);
 };