Seventh patch in making destructors of refcounted objects private.

BUG=26749
Review URL: http://codereview.chromium.org/371006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31192 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/notifications/notification_object_proxy.h b/chrome/browser/notifications/notification_object_proxy.h
index a5ad53b43..ff71bc3 100644
--- a/chrome/browser/notifications/notification_object_proxy.h
+++ b/chrome/browser/notifications/notification_object_proxy.h
@@ -43,6 +43,10 @@
   }
 
  private:
+  friend class base::RefCountedThreadSafe<NotificationObjectProxy>;
+
+  ~NotificationObjectProxy() {}
+
   // Called on UI thread to schedule a message for sending.
   void DeliverMessage(IPC::Message* message);