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diff --git a/Source/JavaScriptCore/dfg/DFGDesiredWriteBarriers.h b/Source/JavaScriptCore/dfg/DFGDesiredWriteBarriers.h
deleted file mode 100644
index cbbb2cb5e..000000000
--- a/Source/JavaScriptCore/dfg/DFGDesiredWriteBarriers.h
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
- * Copyright (C) 2013 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 DFGDesiredWriteBarriers_h
-#define DFGDesiredWriteBarriers_h
-
-#include "WriteBarrier.h"
-#include <wtf/Vector.h>
-
-#if ENABLE(DFG_JIT)
-
-namespace JSC {
-
-class JSFunction;
-class ScriptExecutable;
-class VM;
-struct InlineCallFrame;
-
-namespace DFG {
-
-class DesiredWriteBarrier {
-public:
-    enum Type {
-        ConstantType,
-        InlineCallFrameExecutableType,
-    };
-    DesiredWriteBarrier(Type, CodeBlock*, unsigned index, JSCell* owner);
-    DesiredWriteBarrier(Type, CodeBlock*, InlineCallFrame*, JSCell* owner);
-
-    void trigger(VM&);
-
-private:
-    JSCell* m_owner;
-    Type m_type;
-    CodeBlock* m_codeBlock;
-    union {
-        unsigned index;
-        InlineCallFrame* inlineCallFrame;
-    } m_which;
-};
-
-class DesiredWriteBarriers {
-public:
-    DesiredWriteBarriers();
-    ~DesiredWriteBarriers();
-
-    DesiredWriteBarrier& add(DesiredWriteBarrier::Type type, CodeBlock* codeBlock, unsigned index, JSCell* owner)
-    {
-        m_barriers.append(DesiredWriteBarrier(type, codeBlock, index, owner));
-        return m_barriers.last();
-    }
-    DesiredWriteBarrier& add(DesiredWriteBarrier::Type type, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner)
-    {
-        m_barriers.append(DesiredWriteBarrier(type, codeBlock, inlineCallFrame, owner));
-        return m_barriers.last();
-    }
-
-    void trigger(VM&);
-
-private:
-    Vector<DesiredWriteBarrier> m_barriers;
-};
-
-inline void initializeLazyWriteBarrierForInlineCallFrameExecutable(DesiredWriteBarriers& barriers, WriteBarrier<ScriptExecutable>& barrier, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner, ScriptExecutable* value)
-{
-    DesiredWriteBarrier& desiredBarrier = barriers.add(DesiredWriteBarrier::InlineCallFrameExecutableType, codeBlock, inlineCallFrame, owner);
-    barrier = WriteBarrier<ScriptExecutable>(desiredBarrier, value);
-}
-
-inline void initializeLazyWriteBarrierForConstant(DesiredWriteBarriers& barriers, WriteBarrier<Unknown>& barrier, CodeBlock* codeBlock, unsigned index, JSCell* owner, JSValue value)
-{
-    DesiredWriteBarrier& desiredBarrier = barriers.add(DesiredWriteBarrier::ConstantType, codeBlock, index, owner);
-    barrier = WriteBarrier<Unknown>(desiredBarrier, value);
-}
-
-} } // namespace JSC::DFG
-
-#endif // ENABLE(DFG_JIT)
-
-#endif // DFGDesiredWriteBarriers_h