Remove some straggling zoom-related code.

sky/engine/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 311 matching lines @@
         m_value.valueID = CSSValueMaxContent;
         break;
     case FillAvailable:
         m_primitiveUnitType = CSS_VALUE_ID;
         m_value.valueID = CSSValueWebkitFillAvailable;
         break;
     case FitContent:
         m_primitiveUnitType = CSS_VALUE_ID;
         m_value.valueID = CSSValueWebkitFitContent;
         break;
-    case ExtendToZoom:
-        m_primitiveUnitType = CSS_VALUE_ID;
-        m_value.valueID = CSSValueInternalExtendToZoom;
-        break;
     case Percent:
         m_primitiveUnitType = CSS_PERCENTAGE;
         ASSERT(std::isfinite(length.percent()));
         m_value.num = length.percent();
         break;
     case Fixed:
         m_primitiveUnitType = CSS_PX;
         m_value.num = length.value();
         break;
     case Calculated: {
@@ skipping 1005 matching lines @@
         visitor->trace(m_value.shape);
         break;
     default:
         break;
     }
 #endif
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink