Oilpan: add transition types to Navigator and its supplements.

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 111 matching lines @@
         return false;
 
     return true;
 }
 
 void Navigator::getStorageUpdates()
 {
     // FIXME: Remove this method or rename to yieldForStorageUpdates.
 }
 
+void Navigator::trace(Visitor* visitor)
+{
+    visitor->trace(m_plugins);
+    visitor->trace(m_mimeTypes);
+#if ENABLE(OILPAN)
+    HeapSupplementable<Navigator>::trace(visitor);
+#endif
+}
+
 } // namespace WebCore