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diff --git a/WebCore/html/DOMTokenList.h b/WebCore/html/DOMTokenList.h
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+/*
+ * Copyright (C) 2010, 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
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 DOMTokenList_h
+#define DOMTokenList_h
+
+#include "ExceptionCode.h"
+#include "SpaceSplitString.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+
+class Element;
+
+class DOMTokenList : public Noncopyable {
+public:
+    static PassOwnPtr<DOMTokenList> create(Element* element)
+    {
+        return adoptPtr(new DOMTokenList(element));
+    }
+
+    void ref();
+    void deref();
+
+    unsigned length() const;
+    const AtomicString item(unsigned index) const;
+    bool contains(const AtomicString&, ExceptionCode&) const;
+    void add(const AtomicString&, ExceptionCode&);
+    void remove(const AtomicString&, ExceptionCode&);
+    bool toggle(const AtomicString&, ExceptionCode&);
+    String toString() const;
+
+    void reset(const String&);
+
+    Element* element() { return m_element; }
+
+private:
+    DOMTokenList(Element*);
+
+    void addInternal(const AtomicString&) const;
+    bool containsInternal(const AtomicString&) const;
+    void removeInternal(const AtomicString&) const;
+
+    const SpaceSplitString& classNames() const;
+
+    Element* m_element;
+    SpaceSplitString m_classNamesForQuirksMode;
+};
+
+} // namespace WebCore
+
+#endif // DOMTokenList_h