Add OVERRIDE to jingle/.

jingle/notifier/listener/push_notifications_subscribe_task.h

Index: jingle/notifier/listener/push_notifications_subscribe_task.h
diff --git a/jingle/notifier/listener/push_notifications_subscribe_task.h b/jingle/notifier/listener/push_notifications_subscribe_task.h
index edd65d818b44f2928058c6ba879e1cd5211043cc..3d18496abfc025bf93d06e2e1614af4de16a1ff6 100644
--- a/jingle/notifier/listener/push_notifications_subscribe_task.h
+++ b/jingle/notifier/listener/push_notifications_subscribe_task.h
@@ -10,6 +10,7 @@
 #include <string>
 #include <vector>
 
+#include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "jingle/notifier/listener/notification_defines.h"
 #include "talk/xmllite/xmlelement.h"
@@ -31,9 +32,9 @@ class PushNotificationsSubscribeTask : public buzz::XmppTask {
   virtual ~PushNotificationsSubscribeTask();
 
   // Overridden from XmppTask.
-  virtual int ProcessStart();
-  virtual int ProcessResponse();
-  virtual bool HandleStanza(const buzz::XmlElement* stanza);
+  virtual int ProcessStart() OVERRIDE;
+  virtual int ProcessResponse() OVERRIDE;
+  virtual bool HandleStanza(const buzz::XmlElement* stanza) OVERRIDE;
 
  private:
   // Assembles an Xmpp stanza which can be sent to subscribe to notifications.