Oilpan: make Supplementable tracing more regular.

Source/core/frame/Navigator.cpp

 /*
  *  Copyright (C) 2000 Harri Porten (porten@kde.org)
  *  Copyright (c) 2000 Daniel Molkentin (molkentin@kde.org)
  *  Copyright (c) 2000 Stefan Schimanski (schimmi@kde.org)
  *  Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.
  *  Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 135 matching lines @@
         token = token.stripWhiteSpace();
         if (token.length() >= 3 && token[2] == '_')
             token.replace(2, 1, "-");
     }
 
     return languages;
 }
 
 void Navigator::trace(Visitor* visitor)
 {
+#if ENABLE(OILPAN)
     visitor->trace(m_plugins);
     visitor->trace(m_mimeTypes);
-    WillBeHeapSupplementable<Navigator>::trace(visitor);
+    HeapSupplementable<Navigator>::trace(visitor);
+#endif
     DOMWindowProperty::trace(visitor);
 }
 
 } // namespace blink