Length type Relative is now unused. Remove it.

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 745 matching lines @@
     case Calculated:
         return createExpressionNode(length.calculationValue()->expression(), zoom);
     case Auto:
     case Intrinsic:
     case MinIntrinsic:
     case MinContent:
     case MaxContent:
     case FillAvailable:
     case FitContent:
     case ExtendToZoom:
-    case Relative:
     case Undefined:
         ASSERT_NOT_REACHED();
         return 0;
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 PassRefPtr<CSSCalcValue> CSSCalcValue::create(CSSParserString name, CSSParserValueList* parserValueList, ValueRange range)
 {
     CSSCalcExpressionNodeParser parser;
     RefPtr<CSSCalcExpressionNode> expression;
 
     if (equalIgnoringCase(name, "calc(") || equalIgnoringCase(name, "-webkit-calc("))
         expression = parser.parseCalc(parserValueList);
     // FIXME calc (http://webkit.org/b/16662) Add parsing for min and max here
 
     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