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diff --git a/WebKit/chromium/public/WebIDBTransaction.h b/WebKit/chromium/public/WebIDBTransaction.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 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 WebIDBTransaction_h
+#define WebIDBTransaction_h
+
+#include "WebExceptionCode.h"
+#include "WebString.h"
+
+namespace WebCore { class IDBTransactionBackendInterface; }
+
+namespace WebKit {
+
+class WebIDBObjectStore;
+class WebIDBTransactionCallbacks;
+
+// See comment in WebIDBFactory for a high level overview of these classes.
+class WebIDBTransaction {
+public:
+    virtual ~WebIDBTransaction() { }
+
+    virtual int mode() const
+    {
+        WEBKIT_ASSERT_NOT_REACHED();
+        return 0;
+    }
+    virtual WebIDBObjectStore* objectStore(const WebString& name, WebExceptionCode&)
+    {
+        WEBKIT_ASSERT_NOT_REACHED();
+        return 0;
+    }
+    virtual void abort() { WEBKIT_ASSERT_NOT_REACHED(); }
+    virtual void didCompleteTaskEvents() { WEBKIT_ASSERT_NOT_REACHED(); }
+    virtual void setCallbacks(WebIDBTransactionCallbacks*) { WEBKIT_ASSERT_NOT_REACHED(); }
+
+    // FIXME: this is never called from WebCore. Find a cleaner solution.
+    virtual WebCore::IDBTransactionBackendInterface* getIDBTransactionBackendInterface() const
+    {
+        return 0;
+    }
+
+protected:
+    WebIDBTransaction() {}
+};
+
+} // namespace WebKit
+
+#endif // WebIDBTransaction_h