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diff --git a/src/3rdparty/webkit/WebCore/html/DOMDataGridDataSource.h b/src/3rdparty/webkit/WebCore/html/DOMDataGridDataSource.h
new file mode 100644
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+++ b/src/3rdparty/webkit/WebCore/html/DOMDataGridDataSource.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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
+ * 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 DOMDataGridDataSource_h
+#define DOMDataGridDataSource_h
+
+#if ENABLE(DATAGRID)
+
+#include "DataGridDataSource.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class HTMLDataGridElement;
+
+class DOMDataGridDataSource : public DataGridDataSource {
+public:
+    static PassRefPtr<DOMDataGridDataSource> create()
+    {
+        return adoptRef(new DOMDataGridDataSource);
+    }
+
+    virtual ~DOMDataGridDataSource();
+
+    virtual bool isDOMDataGridDataSource() const { return true; }
+
+private:
+    DOMDataGridDataSource();
+};
+
+inline DOMDataGridDataSource* asDOMDataGridDataSource(DataGridDataSource* dataSource)
+{
+    ASSERT(dataSource->isDOMDataGridDataSource());
+    return static_cast<DOMDataGridDataSource*>(dataSource);
+}
+
+inline const DOMDataGridDataSource* asDOMDataGridDataSource(const DataGridDataSource* dataSource)
+{
+    ASSERT(dataSource->isDOMDataGridDataSource());
+    return static_cast<const DOMDataGridDataSource*>(dataSource);
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(DATAGRID)
+#endif // DOMDataGridDataSource_h