Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/webmidi/MIDIClientMock.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef MIDIClientMock_h
 #define MIDIClientMock_h
 
 #include "modules/webmidi/MIDIClient.h"
 
 namespace WebCore {
 
 // FIXME: This belongs in Source/testing/runner, not compiled into shipping Blink!
-class MIDIClientMock : public MIDIClient {
+class MIDIClientMock FINAL : public MIDIClient {
 public:
     MIDIClientMock();
     virtual ~MIDIClientMock();
 
     void setSysExPermission(bool);
     void resetMock();
 
     // MIDIClient
     virtual void requestSysExPermission(PassRefPtr<MIDIAccess>) OVERRIDE;
     virtual void cancelSysExPermissionRequest(MIDIAccess*) OVERRIDE;
 
 private:
     bool m_allowed;
 };
 
 } // namespace WebCore
 
 #endif // MIDIClient_h