Fix virtual/override/final usage in Source/modules/.

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 39530616abcd4c8e8db177ccd8bffdce14ac1dd2..ba53a6b985763e8f370a641c31af1407bd49239b 100644
--- a/Source/modules/mediastream/RTCPeerConnection.h
+++ b/Source/modules/mediastream/RTCPeerConnection.h
@@ -64,7 +64,7 @@ class RTCPeerConnection final
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RTCPeerConnection);
 public:
     static RTCPeerConnection* create(ExecutionContext*, const Dictionary&, const Dictionary&, ExceptionState&);
-    virtual ~RTCPeerConnection();
+    ~RTCPeerConnection() override;
 
     void createOffer(RTCSessionDescriptionCallback*, RTCErrorCallback*, const Dictionary&, ExceptionState&);
 
@@ -120,27 +120,27 @@ public:
     DEFINE_ATTRIBUTE_EVENT_LISTENER(datachannel);
 
     // WebRTCPeerConnectionHandlerClient
-    virtual void negotiationNeeded() override;
-    virtual void didGenerateICECandidate(const WebRTCICECandidate&) override;
-    virtual void didChangeSignalingState(SignalingState) override;
-    virtual void didChangeICEGatheringState(ICEGatheringState) override;
-    virtual void didChangeICEConnectionState(ICEConnectionState) override;
-    virtual void didAddRemoteStream(const WebMediaStream&) override;
-    virtual void didRemoveRemoteStream(const WebMediaStream&) override;
-    virtual void didAddRemoteDataChannel(WebRTCDataChannelHandler*) override;
-    virtual void releasePeerConnectionHandler() override;
-    virtual void closePeerConnection() override;
+    void negotiationNeeded() override;
+    void didGenerateICECandidate(const WebRTCICECandidate&) override;
+    void didChangeSignalingState(SignalingState) override;
+    void didChangeICEGatheringState(ICEGatheringState) override;
+    void didChangeICEConnectionState(ICEConnectionState) override;
+    void didAddRemoteStream(const WebMediaStream&) override;
+    void didRemoveRemoteStream(const WebMediaStream&) override;
+    void didAddRemoteDataChannel(WebRTCDataChannelHandler*) override;
+    void releasePeerConnectionHandler() override;
+    void closePeerConnection() override;
 
     // EventTarget
-    virtual const AtomicString& interfaceName() const override;
-    virtual ExecutionContext* executionContext() const override;
+    const AtomicString& interfaceName() const override;
+    ExecutionContext* executionContext() const override;
 
     // ActiveDOMObject
-    virtual void suspend() override;
-    virtual void resume() override;
-    virtual void stop() override;
+    void suspend() override;
+    void resume() override;
+    void stop() override;
     // We keep the this object alive until either stopped or closed.
-    virtual bool hasPendingActivity() const override
+    bool hasPendingActivity() const override
     {
         return !m_closed && !m_stopped;
     }