Update remaining core classes to use OVERRIDE / FINAL when needed

Source/core/platform/mediastream/RTCPeerConnectionHandler.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
@@ skipping 38 matching lines @@
 class MediaConstraints;
 class MediaStreamComponent;
 class RTCConfiguration;
 class RTCDTMFSenderHandler;
 class RTCDataChannelHandler;
 class RTCPeerConnectionHandlerClient;
 class RTCSessionDescriptionRequest;
 class RTCStatsRequest;
 class RTCVoidRequest;
 
-class RTCPeerConnectionHandler : public blink::WebRTCPeerConnectionHandlerClient {
+class RTCPeerConnectionHandler FINAL : public blink::WebRTCPeerConnectionHandlerClient {
 public:
     static PassOwnPtr<RTCPeerConnectionHandler> create(RTCPeerConnectionHandlerClient*);
     virtual ~RTCPeerConnectionHandler();
 
     bool createWebHandler();
 
     bool initialize(PassRefPtr<RTCConfiguration>, PassRefPtr<MediaConstraints>);
 
     void createOffer(PassRefPtr<RTCSessionDescriptionRequest>, PassRefPtr<MediaConstraints>);
     void createAnswer(PassRefPtr<RTCSessionDescriptionRequest>, PassRefPtr<MediaConstraints>);
@@ skipping 29 matching lines @@
 private:
     explicit RTCPeerConnectionHandler(RTCPeerConnectionHandlerClient*);
 
     OwnPtr<blink::WebRTCPeerConnectionHandler> m_webHandler;
     RTCPeerConnectionHandlerClient* m_client;
 };
 
 } // namespace WebCore
 
 #endif // RTCPeerConnectionHandler_h