Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/mediastream/RTCVoidRequestImpl.h

Index: Source/modules/mediastream/RTCVoidRequestImpl.h
diff --git a/Source/modules/mediastream/RTCVoidRequestImpl.h b/Source/modules/mediastream/RTCVoidRequestImpl.h
index 1db483fe29441d0eee45608b7f1de40d5cc51dee..afea015c0070f6cd6570c893becfd034df746610 100644
--- a/Source/modules/mediastream/RTCVoidRequestImpl.h
+++ b/Source/modules/mediastream/RTCVoidRequestImpl.h
@@ -39,13 +39,14 @@ namespace WebCore {
 class RTCErrorCallback;
 class VoidCallback;
 
-class RTCVoidRequestImpl : public RTCVoidRequest, public ActiveDOMObject {
+class RTCVoidRequestImpl FINAL : public RTCVoidRequest, public ActiveDOMObject {
 public:
     static PassRefPtr<RTCVoidRequestImpl> create(ExecutionContext*, PassOwnPtr<VoidCallback>, PassOwnPtr<RTCErrorCallback>);
     virtual ~RTCVoidRequestImpl();
 
-    virtual void requestSucceeded();
-    virtual void requestFailed(const String& error);
+    // RTCVoidRequest
+    virtual void requestSucceeded() OVERRIDE;
+    virtual void requestFailed(const String& error) OVERRIDE;
 
     // ActiveDOMObject
     virtual void stop() OVERRIDE;