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

Source/web/MIDIClientProxy.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 26 matching lines @@
 namespace WebCore {
 class MIDIAccess;
 }
 
 namespace blink {
 
 class WebMIDIClient;
 
 class MIDIClientProxy FINAL : public WebCore::MIDIClient {
 public:
-    explicit MIDIClientProxy(WebMIDIClient*);
+    static PassOwnPtr<MIDIClientProxy> create(WebMIDIClient*);
 
     // WebCore::MIDIClient
     virtual void requestSysexPermission(PassRefPtrWillBeRawPtr<WebCore::MIDIAccess>) OVERRIDE;
     virtual void cancelSysexPermissionRequest(WebCore::MIDIAccess*) OVERRIDE;
 
 private:
+    explicit MIDIClientProxy(WebMIDIClient*);
+
     WebMIDIClient* m_client;
 };
 
 } // namespace blink
 
 #endif // MIDIClientProxy_h