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diff --git a/Source/JavaScriptCore/wtf/ListRefPtr.h b/Source/JavaScriptCore/wtf/ListRefPtr.h
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+++ b/Source/JavaScriptCore/wtf/ListRefPtr.h
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+/*
+ *  Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef WTF_ListRefPtr_h
+#define WTF_ListRefPtr_h
+
+#include <wtf/RefPtr.h>
+
+namespace WTF {
+
+    // Specialized version of RefPtr desgined for use in singly-linked lists. 
+    // Derefs the list iteratively to avoid recursive derefing that can overflow the stack.
+    template <typename T> class ListRefPtr : public RefPtr<T> {
+    public:
+        ListRefPtr() : RefPtr<T>() {}
+        ListRefPtr(T* ptr) : RefPtr<T>(ptr) {}
+        ListRefPtr(const RefPtr<T>& o) : RefPtr<T>(o) {}
+        // see comment in PassRefPtr.h for why this takes const reference
+        template <typename U> ListRefPtr(const PassRefPtr<U>& o) : RefPtr<T>(o) {}
+        
+        ~ListRefPtr();
+        
+        ListRefPtr& operator=(T* optr) { RefPtr<T>::operator=(optr); return *this; }
+        ListRefPtr& operator=(const RefPtr<T>& o) { RefPtr<T>::operator=(o); return *this; }
+        ListRefPtr& operator=(const PassRefPtr<T>& o) { RefPtr<T>::operator=(o); return *this; }
+        template <typename U> ListRefPtr& operator=(const RefPtr<U>& o) { RefPtr<T>::operator=(o); return *this; }
+        template <typename U> ListRefPtr& operator=(const PassRefPtr<U>& o) { RefPtr<T>::operator=(o); return *this; }
+    };
+
+    // Remove inline for winscw compiler to prevent the compiler agressively resolving
+    // T::ref() in RefPtr<T>'s copy constructor.  The bug is reported at:
+    // https://xdabug001.ext.nokia.com/bugzilla/show_bug.cgi?id=9812.
+    template <typename T> 
+#if !COMPILER(WINSCW)
+    inline
+#endif
+    ListRefPtr<T>::~ListRefPtr()
+    {
+        RefPtr<T> reaper = this->release();
+        while (reaper && reaper->hasOneRef())
+            reaper = reaper->releaseNext(); // implicitly protects reaper->next, then derefs reaper
+    }
+
+    template <typename T> inline T* getPtr(const ListRefPtr<T>& p)
+    {
+        return p.get();
+    }
+
+} // namespace WTF
+
+using WTF::ListRefPtr;
+
+#endif // WTF_ListRefPtr_h