Remove duplicated headers from core/

Source/core/css/CSSCalculationValue.cpp

 /*
  * Copyright (C) 2011, 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/css/CSSCalculationValue.h"
 
 #include "core/css/CSSPrimitiveValueMappings.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "wtf/MathExtras.h"
 #include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
 #include "wtf/text/StringBuilder.h"
 
 static const int maxExpressionDepth = 100;
 
 enum ParseState {
     OK,
     TooDeep,
     NoMoreTokens
 };
 
@@ skipping 733 matching lines @@
 
     return expression ? adoptRef(new CSSCalcValue(expression, range)) : 0;
 }
 
 PassRefPtr<CSSCalcValue> CSSCalcValue::create(PassRefPtr<CSSCalcExpressionNode> expression, ValueRange range)
 {
     return adoptRef(new CSSCalcValue(expression, range));
 }
 
 } // namespace WebCore