DomStorage: Clear the renderer side cache too when the user clears browsing data.

webkit/dom_storage/dom_storage_namespace.cc

Index: webkit/dom_storage/dom_storage_namespace.cc
===================================================================
--- webkit/dom_storage/dom_storage_namespace.cc	(revision 153968)
+++ webkit/dom_storage/dom_storage_namespace.cc	(working copy)
@@ -63,6 +63,13 @@
   // The in-process-webkit based impl didn't do this either, but would be nice.
 }
 
+DomStorageArea* DomStorageNamespace::GetOpenStorageArea(const GURL& origin) {
+  AreaHolder* holder = GetAreaHolder(origin);
+  if (holder && holder->open_count_)
+    return holder->area_;
+  return NULL;
+}
+
 DomStorageNamespace* DomStorageNamespace::Clone(
     int64 clone_namespace_id,
     const std::string& clone_persistent_namespace_id) {