Length type Relative is now unused. Remove it.

Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 283 matching lines @@
     case ViewportPercentageMax:
         init(length);
         return;
     case Fixed:
         m_primitiveUnitType = CSS_PX;
         m_value.num = length.value() / zoom;
         return;
     case Calculated:
         init(CSSCalcValue::create(length.calculationValue(), zoom));
         return;
-    case Relative:
     case Undefined:
         ASSERT_NOT_REACHED();
         break;
     }
 }
 
 void CSSPrimitiveValue::init(const Length& length)
 {
     switch (length.type()) {
         case Auto:
@@ skipping 47 matching lines @@
             break;
         case ViewportPercentageMin:
             m_primitiveUnitType = CSS_VMIN;
             m_value.num = length.viewportPercentageLength();
             break;
         case ViewportPercentageMax:
             m_primitiveUnitType = CSS_VMAX;
             m_value.num = length.viewportPercentageLength();
             break;
         case Calculated:
-        case Relative:
         case Undefined:
             ASSERT_NOT_REACHED();
             break;
     }
 }
 
 void CSSPrimitiveValue::init(PassRefPtr<Counter> c)
 {
     m_primitiveUnitType = CSS_COUNTER;
     m_hasCachedCSSText = false;
@@ skipping 950 matching lines @@
         return m_value.parserOperator == other.m_value.parserOperator;
     case CSS_CALC:
         return m_value.calc && other.m_value.calc && m_value.calc->equals(*other.m_value.calc);
     case CSS_SHAPE:
         return m_value.shape && other.m_value.shape && m_value.shape->equals(*other.m_value.shape);
     }
     return false;
 }
 
 } // namespace WebCore