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

chrome/browser/browsing_data_indexed_db_helper.cc

Index: chrome/browser/browsing_data_indexed_db_helper.cc
diff --git a/chrome/browser/browsing_data_indexed_db_helper.cc b/chrome/browser/browsing_data_indexed_db_helper.cc
index 0a03bf2b8060ccb6895bad4e67150c4584e0e315..cea41cffa12a5665c970322cdc0c48624c6d5c38 100644
--- a/chrome/browser/browsing_data_indexed_db_helper.cc
+++ b/chrome/browser/browsing_data_indexed_db_helper.cc
@@ -208,6 +208,17 @@ CannedBrowsingDataIndexedDBHelper::CannedBrowsingDataIndexedDBHelper(
   DCHECK(profile);
 }
 
+CannedBrowsingDataIndexedDBHelper* CannedBrowsingDataIndexedDBHelper::Clone() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  CannedBrowsingDataIndexedDBHelper* clone =
+      new CannedBrowsingDataIndexedDBHelper(profile_);
+
+  base::AutoLock auto_lock(lock_);
+  clone->pending_indexed_db_info_ = pending_indexed_db_info_;
+  clone->indexed_db_info_ = indexed_db_info_;
+  return clone;
+}
+
 void CannedBrowsingDataIndexedDBHelper::AddIndexedDB(
     const GURL& origin, const string16& description) {
   base::AutoLock auto_lock(lock_);