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

Source/modules/webmidi/MIDIController.cpp

 /*
  * 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 23 matching lines @@
 #include "modules/webmidi/MIDIAccess.h"
 #include "modules/webmidi/MIDIClient.h"
 
 namespace WebCore {
 
 const char* MIDIController::supplementName()
 {
     return "MIDIController";
 }
 
-MIDIController::MIDIController(MIDIClient* client)
+MIDIController::MIDIController(PassOwnPtr<MIDIClient> client)
     : m_client(client)
 {
-    ASSERT(client);
+    ASSERT(m_client);

[gyuyoung-inactive, 2014/04/03 06:30:11]

I missed that client becomes a null after passing ownership to m_client. So, I
change to check assertion with m_client.

 }
 
 MIDIController::~MIDIController()
 {
 }
 
-PassOwnPtr<MIDIController> MIDIController::create(MIDIClient* client)
+PassOwnPtr<MIDIController> MIDIController::create(PassOwnPtr<MIDIClient> client)
 {
     return adoptPtr(new MIDIController(client));
 }
 
 void MIDIController::requestSysexPermission(PassRefPtrWillBeRawPtr<MIDIAccess> access)
 {
     m_client->requestSysexPermission(access);
 }
 
 void MIDIController::cancelSysexPermissionRequest(MIDIAccess* access)
 {
     m_client->cancelSysexPermissionRequest(access);
 }
 
-void provideMIDITo(Page& page, MIDIClient* client)
+void provideMIDITo(Page& page, PassOwnPtr<MIDIClient> client)
 {
     MIDIController::provideTo(page, MIDIController::supplementName(), MIDIController::create(client));
 }
 
 } // namespace WebCore