Restore sessionStorage when chrome restarts.

content/browser/in_process_webkit/dom_storage_message_filter.h

Index: content/browser/in_process_webkit/dom_storage_message_filter.h
diff --git a/content/browser/in_process_webkit/dom_storage_message_filter.h b/content/browser/in_process_webkit/dom_storage_message_filter.h
index 75839c2b2e974e5c5f6ae09cf531784d1484912e..fb280e2b256ddf48e33ddf309bf005435472d336 100644
--- a/content/browser/in_process_webkit/dom_storage_message_filter.h
+++ b/content/browser/in_process_webkit/dom_storage_message_filter.h
@@ -68,6 +68,9 @@ class DOMStorageMessageFilter : public content::BrowserMessageFilter {
     return webkit_context_->dom_storage_context();
   }
 
+  void NotifyOnUIThread(int64 namespace_id,
+                        const FilePath& session_storage_directory);
+
   // Use whenever there's a chance OnStorageEvent will be called.
   class ScopedStorageEventContext {
    public: