Inherit EventTarget interface instead of duplicating its code

Source/modules/webmidi/MIDIAccess.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 29 matching lines @@
 #include "modules/webmidi/MIDIOutput.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class ScriptExecutionContext;
 class MIDIAccessPromise;
 
-class MIDIAccess : public RefCounted<MIDIAccess>, public ScriptWrappable, public ActiveDOMObject, public EventTarget, public MIDIAccessorClient {
+class MIDIAccess : public EventTarget, public RefCounted<MIDIAccess>, public ScriptWrappable, public ActiveDOMObject, public MIDIAccessorClient {
 public:
     virtual ~MIDIAccess();
     static PassRefPtr<MIDIAccess> create(ScriptExecutionContext*, MIDIAccessPromise*);
 
     MIDIInputVector inputs() const { return m_inputs; }
     MIDIOutputVector outputs() const { return m_outputs; }
 
     using RefCounted<MIDIAccess>::ref;
     using RefCounted<MIDIAccess>::deref;
 
@@ skipping 29 matching lines @@
     EventTargetData m_eventTargetData;
     MIDIAccessPromise* m_promise;
 
     OwnPtr<MIDIAccessor> m_accessor;
     bool m_hasAccess;
 };
 
 } // namespace WebCore
 
 #endif // MIDIAccess_h