Web MIDI: MIDIInput/MIDIOutput should not have reference to MIDIAccess

Source/modules/webmidi/MIDIOutput.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 35 matching lines @@
     static PassRefPtr<MIDIOutput> create(MIDIAccess*, unsigned portIndex, ScriptExecutionContext*, const String& id, const String& manufacturer, const String& name, const String& version);
     virtual ~MIDIOutput();
 
     void send(Uint8Array*, double timestamp, ExceptionState&);
     void send(Vector<unsigned>, double timestamp, ExceptionState&);
 
     // send() without optional |timestamp|.
     void send(Uint8Array*, ExceptionState&);
     void send(Vector<unsigned>, ExceptionState&);
 
+    MIDIAccess* midiAccess() const { return m_access; }
+
 private:
     MIDIOutput(MIDIAccess*, unsigned portIndex, ScriptExecutionContext*, const String& id, const String& manufacturer, const String& name, const String& version);
 
-    RefPtr<MIDIAccess> m_access;
+    MIDIAccess* m_access;
     unsigned m_portIndex;
 };
 
 typedef Vector<RefPtr<MIDIOutput> > MIDIOutputVector;
 
 } // namespace WebCore
 
 #endif // MIDIOutput_h