Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/notifications/NotificationCenter.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 34 matching lines @@
 #include "wtf/OwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class NotificationClient;
 class VoidCallback;
 
-class NotificationCenter : public RefCounted<NotificationCenter>, public ScriptWrappable, public ActiveDOMObject {
+class NotificationCenter FINAL : public RefCounted<NotificationCenter>, public ScriptWrappable, public ActiveDOMObject {
 public:
     static PassRefPtr<NotificationCenter> create(ExecutionContext*, NotificationClient*);
 
     PassRefPtr<WebKitNotification> createNotification(const String& iconUrl, const String& title, const String& body, ExceptionState& exceptionState)
     {
         if (!client()) {
             exceptionState.throwDOMException(InvalidStateError, "The notification client is null.");
             return 0;
         }
         return WebKitNotification::create(title, body, iconUrl, executionContext(), exceptionState, this);
@@ skipping 26 matching lines @@
 
     NotificationClient* m_client;
     HashSet<RefPtr<NotificationRequestCallback> > m_callbacks;
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(LEGACY_NOTIFICATIONS)
 
 #endif // NotificationCenter_h