Oilpan: Remove converters between Persistent/Member and PassRefPtr/RefPtr.

Source/modules/webmidi/MIDIConnectionEvent.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 "modules/EventModules.h"
 #include "modules/webmidi/MIDIPort.h"
 
 namespace WebCore {
 
 struct MIDIConnectionEventInit : public EventInit {
     MIDIConnectionEventInit()
         : port(nullptr)
     {
-    };
+    }
 
-    RefPtr<MIDIPort> port;
+    RefPtrWillBeMember<MIDIPort> port;
 };
 
 class MIDIConnectionEvent FINAL : public Event {
 public:
     static PassRefPtrWillBeRawPtr<MIDIConnectionEvent> create();
     static PassRefPtrWillBeRawPtr<MIDIConnectionEvent> create(const AtomicString&, PassRefPtrWillBeRawPtr<MIDIPort>);
     static PassRefPtrWillBeRawPtr<MIDIConnectionEvent> create(const AtomicString&, const MIDIConnectionEventInit&);
 
     PassRefPtrWillBeRawPtr<MIDIPort> port() { return m_port; }
 
     virtual const AtomicString& interfaceName() const OVERRIDE { return EventNames::MIDIConnectionEvent; }
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     MIDIConnectionEvent();
     MIDIConnectionEvent(const AtomicString&, PassRefPtrWillBeRawPtr<MIDIPort>);
     MIDIConnectionEvent(const AtomicString&, const MIDIConnectionEventInit&);
 
     RefPtrWillBeMember<MIDIPort> m_port;
 };
 
 } // namespace WebCore
 
 #endif // MIDIConnectionEvent_h