Oilpan: make Supplementable tracing more regular.

Source/core/workers/WorkerGlobalScope.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 308 matching lines @@
     // FIXME: How should we count features for shared/service workers?
 }
 
 ConsoleMessageStorage* WorkerGlobalScope::messageStorage()
 {
     return m_messageStorage.get();
 }
 
 void WorkerGlobalScope::trace(Visitor* visitor)
 {
+#if ENABLE(OILPAN)
     visitor->trace(m_console);
     visitor->trace(m_location);
     visitor->trace(m_navigator);
     visitor->trace(m_workerInspectorController);
     visitor->trace(m_eventQueue);
     visitor->trace(m_workerClients);
     visitor->trace(m_messageStorage);
-    WillBeHeapSupplementable<WorkerGlobalScope>::trace(visitor);
+    HeapSupplementable<WorkerGlobalScope>::trace(visitor);
+#endif
     ExecutionContext::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink