Incorporating review feedback from https://codereview.chromium.org/24294002/

Source/bindings/dart/DartCustomElementBinding.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 24 matching lines @@
 #include "wtf/PassRefPtr.h"
 
 #include <dart_api.h>
 
 namespace WebCore {
 
 class DartCustomElementBinding {
 public:
     static PassOwnPtr<DartCustomElementBinding> create(Dart_Handle customType);
 
-    Dart_Handle customType() { return Dart_HandleFromPersistent(m_customType); }
+    Dart_PersistentHandle customType() { return m_customType; }
 
 private:
     DartCustomElementBinding(Dart_Handle customType);
     Dart_PersistentHandle m_customType;
 };
 
 }
 
 #endif // CustomElementBinding_h