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diff --git a/Source/JavaScriptCore/runtime/JSLexicalEnvironment.h b/Source/JavaScriptCore/runtime/JSLexicalEnvironment.h
deleted file mode 100644
index 9516318d7..000000000
--- a/Source/JavaScriptCore/runtime/JSLexicalEnvironment.h
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright (C) 2008, 2009, 2013-2015 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.
- * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * 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 JSLexicalEnvironment_h
-#define JSLexicalEnvironment_h
-
-#include "CodeBlock.h"
-#include "CopiedSpaceInlines.h"
-#include "JSEnvironmentRecord.h"
-#include "SymbolTable.h"
-
-namespace JSC {
-
-class Register;
-    
-class JSLexicalEnvironment : public JSEnvironmentRecord {
-private:
-    JSLexicalEnvironment(VM&, Structure*, JSScope*, SymbolTable*);
-    
-public:
-    typedef JSEnvironmentRecord Base;
-    static const unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesGetPropertyNames;
-
-    static JSLexicalEnvironment* create(
-        VM& vm, Structure* structure, JSScope* currentScope, SymbolTable* symbolTable, JSValue initialValue)
-    {
-        JSLexicalEnvironment* result = 
-            new (
-                NotNull,
-                allocateCell<JSLexicalEnvironment>(vm.heap, allocationSize(symbolTable)))
-            JSLexicalEnvironment(vm, structure, currentScope, symbolTable);
-        result->finishCreation(vm, initialValue);
-        return result;
-    }
-
-    static JSLexicalEnvironment* create(VM& vm, JSGlobalObject* globalObject, JSScope* currentScope, SymbolTable* symbolTable, JSValue initialValue)
-    {
-        Structure* structure = globalObject->activationStructure();
-        return create(vm, structure, currentScope, symbolTable, initialValue);
-    }
-        
-    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
-    static void getOwnNonIndexPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
-
-    static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
-
-    static bool deleteProperty(JSCell*, ExecState*, PropertyName);
-
-    static JSValue toThis(JSCell*, ExecState*, ECMAMode);
-
-    DECLARE_INFO;
-
-    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject) { return Structure::create(vm, globalObject, jsNull(), TypeInfo(ActivationObjectType, StructureFlags), info()); }
-
-private:
-    bool symbolTableGet(PropertyName, PropertySlot&);
-    bool symbolTablePut(ExecState*, PropertyName, JSValue, bool shouldThrow);
-    bool symbolTablePutWithAttributes(VM&, PropertyName, JSValue, unsigned attributes);
-};
-
-inline JSLexicalEnvironment::JSLexicalEnvironment(VM& vm, Structure* structure, JSScope* currentScope, SymbolTable* symbolTable)
-    : Base(vm, structure, currentScope, symbolTable)
-{
-}
-
-inline JSLexicalEnvironment* asActivation(JSValue value)
-{
-    ASSERT(asObject(value)->inherits(JSLexicalEnvironment::info()));
-    return jsCast<JSLexicalEnvironment*>(asObject(value));
-}
-    
-ALWAYS_INLINE JSLexicalEnvironment* Register::lexicalEnvironment() const
-{
-    return asActivation(jsValue());
-}
-
-} // namespace JSC
-
-#endif // JSLexicalEnvironment_h