Move viewport unit resolution to style recalc time

Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 4429 matching lines @@
 {
     ASSERT(!hasVariableReference());
     if ((supported & FixedConversion) && isLength())
         return computeLength<Length>(conversionData);
     if ((supported & PercentConversion) && isPercentage())
         return Length(getDoubleValue(), Percent);
     if ((supported & AutoConversion) && getValueID() == CSSValueAuto)
         return Length(Auto);
     if ((supported & FixedConversion) && (supported & PercentConversion) && isCalculated())
         return Length(cssCalcValue()->toCalcValue(conversionData));
-    if ((supported & FixedConversion) && isViewportPercentageLength())
-        return viewportPercentageLength();
     return Length(Undefined);
 }
 
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(EBufferedRendering e)
     : CSSValue(PrimitiveClass)
 {
     m_primitiveUnitType = CSS_VALUE_ID;
     switch (e) {
     case BR_AUTO:
         m_value.valueID = CSSValueAuto;
@@ skipping 484 matching lines @@
         break;
     }
 
     ASSERT_NOT_REACHED();
     return TouchActionDelayNone;
 }
 
 }
 
 #endif