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diff --git a/Source/WebKit2/UIProcess/GenericCallback.h b/Source/WebKit2/UIProcess/GenericCallback.h
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+++ b/Source/WebKit2/UIProcess/GenericCallback.h
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+/*
+ * Copyright (C) 2010 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. 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 GenericCallback_h
+#define GenericCallback_h
+
+#include "WKAPICast.h"
+
+#include "WebError.h"
+#include <wtf/HashMap.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebKit {
+
+template<typename APIReturnValueType, typename InternalReturnValueType = typename APITypeInfo<APIReturnValueType>::ImplType>
+class GenericCallback : public RefCounted<GenericCallback<APIReturnValueType, InternalReturnValueType> > {
+public:
+    typedef void (*CallbackFunction)(APIReturnValueType, WKErrorRef, void*);
+
+    static PassRefPtr<GenericCallback> create(void* context, CallbackFunction callback)
+    {
+        return adoptRef(new GenericCallback(context, callback));
+    }
+
+    ~GenericCallback()
+    {
+        ASSERT(!m_callback);
+    }
+
+    void performCallbackWithReturnValue(InternalReturnValueType returnValue)
+    {
+        ASSERT(m_callback);
+
+        m_callback(toAPI(returnValue), 0, m_context);
+
+        m_callback = 0;
+    }
+    
+    void invalidate()
+    {
+        ASSERT(m_callback);
+
+        RefPtr<WebError> error = WebError::create();
+        m_callback(0, toAPI(error.get()), m_context);
+        
+        m_callback = 0;
+    }
+
+    uint64_t callbackID() const { return m_callbackID; }
+
+private:
+    static uint64_t generateCallbackID()
+    {
+        static uint64_t uniqueCallbackID = 1;
+        return uniqueCallbackID++;
+    }
+
+    GenericCallback(void* context, CallbackFunction callback)
+        : m_context(context)
+        , m_callback(callback)
+        , m_callbackID(generateCallbackID())
+    {
+    }
+
+    void* m_context;
+    CallbackFunction m_callback;
+    uint64_t m_callbackID;
+};
+
+template<typename T>
+void invalidateCallbackMap(HashMap<uint64_t, T>& map)
+{
+    Vector<T> callbacksVector;
+    copyValuesToVector(map, callbacksVector);
+    for (size_t i = 0, size = callbacksVector.size(); i < size; ++i)
+        callbacksVector[i]->invalidate();
+    map.clear();
+}
+
+} // namespace WebKit
+
+#endif // GenericCallback_h