Inherit EventTarget interface instead of duplicating its code

Source/modules/webmidi/MIDIPort.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 22 matching lines @@
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/EventTarget.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
-class MIDIPort : public RefCounted<MIDIPort>, public ScriptWrappable, public ActiveDOMObject, public EventTarget {
+class MIDIPort : public EventTarget, public RefCounted<MIDIPort>, public ScriptWrappable, public ActiveDOMObject {
 public:
     enum MIDIPortTypeCode {
         MIDIPortTypeInput,
         MIDIPortTypeOutput
     };
 
     static PassRefPtr<MIDIPort> create(ScriptExecutionContext*, const String& id, const String& manufacturer, const String& name, MIDIPortTypeCode, const String& version);
     virtual ~MIDIPort();
 
     String id() const { return m_id; }
@@ skipping 30 matching lines @@
     MIDIPortTypeCode m_type;
     String m_version;
     EventTargetData m_eventTargetData;
 };
 
 typedef Vector<RefPtr<MIDIPort> > MIDIPortVector;
 
 } // namespace WebCore
 
 #endif // MIDIPort_h