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

chrome/browser/browsing_data_local_storage_helper.cc

Index: chrome/browser/browsing_data_local_storage_helper.cc
diff --git a/chrome/browser/browsing_data_local_storage_helper.cc b/chrome/browser/browsing_data_local_storage_helper.cc
index 5ce2d8cd2285644d72f23efd321e6374ba39e79f..53fef02506b31e0afb65e9a0ea2edabaad86fbd4 100644
--- a/chrome/browser/browsing_data_local_storage_helper.cc
+++ b/chrome/browser/browsing_data_local_storage_helper.cc
@@ -147,7 +147,20 @@ void BrowsingDataLocalStorageHelper::DeleteLocalStorageFileInWebKitThread(
 
 CannedBrowsingDataLocalStorageHelper::CannedBrowsingDataLocalStorageHelper(
     Profile* profile)
-    : BrowsingDataLocalStorageHelper(profile) {
+    : BrowsingDataLocalStorageHelper(profile),
+      profile_(profile) {
+}
+
+CannedBrowsingDataLocalStorageHelper*
+CannedBrowsingDataLocalStorageHelper::Clone() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  CannedBrowsingDataLocalStorageHelper* clone =
+      new CannedBrowsingDataLocalStorageHelper(profile_);
+
+  base::AutoLock auto_lock(lock_);
+  clone->pending_local_storage_info_ = pending_local_storage_info_;
+  clone->local_storage_info_ = local_storage_info_;
+  return clone;
 }
 
 void CannedBrowsingDataLocalStorageHelper::AddLocalStorage(