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diff --git a/JavaScriptCore/wtf/text/AtomicStringHash.h b/JavaScriptCore/wtf/text/AtomicStringHash.h
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+++ b/JavaScriptCore/wtf/text/AtomicStringHash.h
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+/*
+ * Copyright (C) 2008 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
+ *     documentation and/or other materials provided with the distribution. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef AtomicStringHash_h
+#define AtomicStringHash_h
+
+#include <wtf/text/AtomicString.h>
+#include <wtf/HashTraits.h>
+
+namespace WTF {
+
+    struct AtomicStringHash {
+        static unsigned hash(const AtomicString& key)
+        {
+            return key.impl()->existingHash();
+        }
+
+        static bool equal(const AtomicString& a, const AtomicString& b)
+        {
+            return a == b;
+        }
+
+        static const bool safeToCompareToEmptyOrDeleted = false;
+    };
+
+    // AtomicStringHash is the default hash for AtomicString
+    template<> struct HashTraits<WTF::AtomicString> : GenericHashTraits<WTF::AtomicString> {
+        static const bool emptyValueIsZero = true;
+        static void constructDeletedValue(WTF::AtomicString& slot) { new (&slot) WTF::AtomicString(HashTableDeletedValue); }
+        static bool isDeletedValue(const WTF::AtomicString& slot) { return slot.isHashTableDeletedValue(); }
+    };
+
+}
+
+using WTF::AtomicStringHash;
+
+#endif