Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/mediastream/RTCPeerConnection.h

Index: Source/modules/mediastream/RTCPeerConnection.h
diff --git a/Source/modules/mediastream/RTCPeerConnection.h b/Source/modules/mediastream/RTCPeerConnection.h
index 3b74ce982577f3608fd396c435ca5be7ddfd0feb..3f24836b6baa697832ca766a063d166c1d8167f3 100644
--- a/Source/modules/mediastream/RTCPeerConnection.h
+++ b/Source/modules/mediastream/RTCPeerConnection.h
@@ -56,11 +56,11 @@ class RTCSessionDescriptionCallback;
 class RTCStatsCallback;
 class VoidCallback;
 
-class RTCPeerConnection : public RefCounted<RTCPeerConnection>, public ScriptWrappable, public RTCPeerConnectionHandlerClient, public EventTargetWithInlineData, public ActiveDOMObject {
+class RTCPeerConnection FINAL : public RefCounted<RTCPeerConnection>, public ScriptWrappable, public RTCPeerConnectionHandlerClient, public EventTargetWithInlineData, public ActiveDOMObject {
     REFCOUNTED_EVENT_TARGET(RTCPeerConnection);
 public:
     static PassRefPtr<RTCPeerConnection> create(ExecutionContext*, const Dictionary& rtcConfiguration, const Dictionary& mediaConstraints, ExceptionState&);
-    ~RTCPeerConnection();
+    virtual ~RTCPeerConnection();
 
     void createOffer(PassOwnPtr<RTCSessionDescriptionCallback>, PassOwnPtr<RTCErrorCallback>, const Dictionary& mediaConstraints, ExceptionState&);