Oilpan: Prepare to make ExecutionContext GarbageCollectedMixin.

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 130 matching lines @@
         virtual void trace(Visitor*) OVERRIDE;
 
     protected:
         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:
+#if !ENABLE(OILPAN)
         virtual void refExecutionContext() OVERRIDE FINAL { ref(); }
         virtual void derefExecutionContext() OVERRIDE FINAL { deref(); }
+#endif
 
         virtual const KURL& virtualURL() const OVERRIDE FINAL;
         virtual KURL virtualCompleteURL(const String&) const OVERRIDE FINAL;
 
         virtual void reportBlockedScriptExecutionToInspector(const String& directiveText) OVERRIDE FINAL;
         virtual void addMessage(MessageSource, MessageLevel, const String& message, const String& sourceURL, unsigned lineNumber, ScriptState* = 0) OVERRIDE FINAL;
 
         virtual EventTarget* errorEventTarget() OVERRIDE FINAL;
         virtual void didUpdateSecurityOrigin() OVERRIDE FINAL { }
 
@@ skipping 16 matching lines @@
 
         double m_timeOrigin;
         TerminationObserver* m_terminationObserver;
     };
 
 DEFINE_TYPE_CASTS(WorkerGlobalScope, ExecutionContext, context, context->isWorkerGlobalScope(), context.isWorkerGlobalScope());
 
 } // namespace WebCore
 
 #endif // WorkerGlobalScope_h