Make DatabaseDispatcherHost be a message filter so that ResourceMessageFilter...

chrome/browser/renderer_host/resource_message_filter.h

Index: chrome/browser/renderer_host/resource_message_filter.h
===================================================================
--- chrome/browser/renderer_host/resource_message_filter.h	(revision 68877)
+++ chrome/browser/renderer_host/resource_message_filter.h	(working copy)
@@ -33,7 +33,6 @@
 
 class BlobDispatcherHost;
 class ChromeURLRequestContext;
-class DatabaseDispatcherHost;
 class DOMStorageDispatcherHost;
 class FileSystemDispatcherHost;
 class FileUtilitiesDispatcherHost;
@@ -450,9 +449,6 @@
   // Handles Indexed Database related messages.
   scoped_refptr<IndexedDBDispatcherHost> indexed_db_dispatcher_host_;
 
-  // Handles HTML5 DB related messages
-  scoped_refptr<DatabaseDispatcherHost> db_dispatcher_host_;
-
   // A cache of notifications preferences which is used to handle
   // Desktop Notifications permission messages.
   scoped_refptr<NotificationsPrefsCache> notification_prefs_;