Oilpan: Move WorkerClients to the managed heap and trace its supplements.

Source/core/workers/WorkerGlobalScope.h

 /*
  * Copyright (C) 2008, 2009 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 113 matching lines @@
         double timeOrigin() const { return m_timeOrigin; }
 
         WorkerClients* clients() { return m_workerClients.get(); }
 
         using SecurityContext::securityOrigin;
         using SecurityContext::contentSecurityPolicy;
 
         virtual void trace(Visitor*);
 
     protected:
-        WorkerGlobalScope(const KURL&, const String& userAgent, WorkerThread*, double timeOrigin, PassOwnPtr<WorkerClients>);
+        WorkerGlobalScope(const KURL&, const String& userAgent, WorkerThread*, double timeOrigin, PassOwnPtrWillBeRawPtr<WorkerClients>);
         void applyContentSecurityPolicyFromString(const String& contentSecurityPolicy, ContentSecurityPolicyHeaderType);
 
         virtual void logExceptionToConsole(const String& errorMessage, const String& sourceURL, int lineNumber, int columnNumber, PassRefPtr<ScriptCallStack>) OVERRIDE;
         void addMessageToWorkerConsole(MessageSource, MessageLevel, const String& message, const String& sourceURL, unsigned lineNumber, PassRefPtr<ScriptCallStack>, ScriptState*);
 
     private:
         virtual void refExecutionContext() OVERRIDE FINAL { ref(); }
         virtual void derefExecutionContext() OVERRIDE FINAL { deref(); }
 
         virtual const KURL& virtualURL() const OVERRIDE FINAL;
@@ skipping 13 matching lines @@
         mutable RefPtrWillBeMember<WorkerNavigator> m_navigator;
 
         OwnPtr<WorkerScriptController> m_script;
         WorkerThread* m_thread;
 
         OwnPtr<WorkerInspectorController> m_workerInspectorController;
         bool m_closing;
 
         OwnPtr<WorkerEventQueue> m_eventQueue;
 
-        OwnPtr<WorkerClients> m_workerClients;
+        OwnPtrWillBeMember<WorkerClients> m_workerClients;
 
         double m_timeOrigin;
     };
 
 DEFINE_TYPE_CASTS(WorkerGlobalScope, ExecutionContext, context, context->isWorkerGlobalScope(), context.isWorkerGlobalScope());
 
 } // namespace WebCore
 
 #endif // WorkerGlobalScope_h