Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/mediastream/RTCDataChannel.h

 /*
  * Copyright (C) 2012 Google 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 24 matching lines @@
 struct WebRTCDataChannelInit;
 }
 
 namespace WebCore {
 
 class Blob;
 class ExceptionState;
 class RTCDataChannelHandler;
 class RTCPeerConnectionHandler;
 
-class RTCDataChannel : public RefCounted<RTCDataChannel>, public ScriptWrappable, public EventTargetWithInlineData, public RTCDataChannelHandlerClient {
+class RTCDataChannel FINAL : public RefCounted<RTCDataChannel>, public ScriptWrappable, public EventTargetWithInlineData, public RTCDataChannelHandlerClient {
     REFCOUNTED_EVENT_TARGET(RTCDataChannel);
 public:
     static PassRefPtr<RTCDataChannel> create(ExecutionContext*, PassOwnPtr<RTCDataChannelHandler>);
     static PassRefPtr<RTCDataChannel> create(ExecutionContext*, RTCPeerConnectionHandler*, const String& label, const blink::WebRTCDataChannelInit&, ExceptionState&);
-    ~RTCDataChannel();
+    virtual ~RTCDataChannel();
 
     String label() const;
 
     // DEPRECATED
     bool reliable() const;
 
     bool ordered() const;
     unsigned short maxRetransmitTime() const;
     unsigned short maxRetransmits() const;
     String protocol() const;
@@ skipping 48 matching lines @@
     };
     BinaryType m_binaryType;
 
     Timer<RTCDataChannel> m_scheduledEventTimer;
     Vector<RefPtr<Event> > m_scheduledEvents;
 };
 
 } // namespace WebCore
 
 #endif // RTCDataChannel_h