Oilpan: Reduce RefPtr to WorkerGlobalScope.

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 194 matching lines @@
         m_terminationObserver->wasRequestedToTerminate();
 }
 
 void WorkerGlobalScope::dispose()
 {
     ASSERT(thread()->isCurrentThread());
 
     clearScript();
     clearInspector();
     setClient(0);
+    deleteLifecycleNotifier();
 
     // We do not clear the thread field of the
     // WorkerGlobalScope. Other objects keep the worker global scope
     // alive because they need its thread field to check that work is
     // being carried out on the right thread. We therefore cannot clear
     // the thread field before all references to the worker global
     // scope are gone.
 }
 
 void WorkerGlobalScope::importScripts(const Vector<String>& urls, ExceptionState& exceptionState)
@@ skipping 100 matching lines @@
     visitor->trace(m_console);
     visitor->trace(m_location);
     visitor->trace(m_navigator);
     visitor->trace(m_workerClients);
     WillBeHeapSupplementable<WorkerGlobalScope>::trace(visitor);
     ExecutionContext::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore