Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/encryptedmedia/MediaKeySession.h

 /*
  * Copyright (C) 2013 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 32 matching lines @@
 class ContentDecryptionModuleSession;
 class ExceptionState;
 class GenericEventQueue;
 class MediaKeyError;
 class MediaKeys;
 
 // References are held by JS and MediaKeys.
 // Because this object controls the lifetime of the ContentDecryptionModuleSession,
 // it may outlive any references to it as long as the MediaKeys object is alive.
 // The ContentDecryptionModuleSession has the same lifetime as this object.
-class MediaKeySession
+class MediaKeySession FINAL
     : public RefCounted<MediaKeySession>, public ScriptWrappable, public EventTargetWithInlineData, public ContextLifecycleObserver
     , private ContentDecryptionModuleSessionClient {
     REFCOUNTED_EVENT_TARGET(MediaKeySession);
 public:
     static PassRefPtr<MediaKeySession> create(ExecutionContext*, ContentDecryptionModule*, MediaKeys*);
-    ~MediaKeySession();
+    virtual ~MediaKeySession();
 
     const String& keySystem() const { return m_keySystem; }
     String sessionId() const;
 
     void setError(MediaKeyError*);
     MediaKeyError* error() { return m_error.get(); }
 
     void initializeNewSession(const String& mimeType, Uint8Array* initData);
     void update(Uint8Array* response, ExceptionState&);
     void release(ExceptionState&);
@@ skipping 34 matching lines @@
     Deque<InitializeNewSessionData> m_pendingInitializeNewSessionData;
     Timer<MediaKeySession> m_initializeNewSessionTimer;
 
     Deque<RefPtr<Uint8Array> > m_pendingKeys;
     Timer<MediaKeySession> m_updateTimer;
 };
 
 }
 
 #endif // MediaKeySession_h