Make IDL Callbacks non-refcounted by default

Source/modules/notifications/NotificationClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Apple 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.
@@ skipping 59 matching lines @@
 
     // Informs the presenter the controller attached to the page has been destroyed.
     virtual void notificationControllerDestroyed() = 0;
 
 #if ENABLE(LEGACY_NOTIFICATIONS)
     // Requests user permission to show desktop notifications from a particular
     // script context. The callback parameter should be run when the user has
     // made a decision.
     virtual void requestPermission(ExecutionContext*, PassRefPtr<VoidCallback>) = 0;
 #endif
-    virtual void requestPermission(ExecutionContext*, PassRefPtr<NotificationPermissionCallback>) = 0;
+    virtual void requestPermission(ExecutionContext*, PassOwnPtr<NotificationPermissionCallback>) = 0;
 
     // Cancel all outstanding requests for the ExecutionContext
     virtual void cancelRequestsForPermission(ExecutionContext*) = 0;
 
     // Checks the current level of permission.
     virtual Permission checkPermission(ExecutionContext*) = 0;
 
 protected:
     virtual ~NotificationClient() { }
 };
 
 void provideNotification(Page*, NotificationClient*);
 
 } // namespace WebCore
 
 #endif // NotificationClient_h