Apply OwnPtr|PassOwnPtr to handle member variables and arguments in MIDIClient

Source/modules/webmidi/MIDIController.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 28 matching lines @@
 class MIDIAccess;
 class MIDIClient;
 
 class MIDIController FINAL : public Supplement<Page> {
 public:
     virtual ~MIDIController();
 
     void requestSysexPermission(PassRefPtrWillBeRawPtr<MIDIAccess>);
     void cancelSysexPermissionRequest(MIDIAccess*);
 
-    static PassOwnPtr<MIDIController> create(MIDIClient*);
+    static PassOwnPtr<MIDIController> create(PassOwnPtr<MIDIClient>);
     static const char* supplementName();
     static MIDIController* from(Page* page) { return static_cast<MIDIController*>(Supplement<Page>::from(page, supplementName())); }
 
 protected:
-    explicit MIDIController(MIDIClient*);
+    explicit MIDIController(PassOwnPtr<MIDIClient>);
 
 private:
-    MIDIClient* m_client;
+    OwnPtr<MIDIClient> m_client;
 };
 
 } // namespace WebCore
 
 #endif // MIDIController_h