Refactor unitTable access

Source/core/css/CSSPrimitiveValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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.
  *
@@ skipping 132 matching lines @@
         ULength,
         UAngle,
         UTime,
         UFrequency,
         UResolution,
         UOther
     };
     static UnitCategory unitCategory(CSSPrimitiveValue::UnitTypes);
 
     typedef HashMap<String, CSSPrimitiveValue::UnitTypes> UnitTable;
-    static UnitTable& getUnitTable();
+    static UnitTypes fromName(const String& unit);
 
     bool isAngle() const
     {
         return m_primitiveUnitType == CSS_DEG
                || m_primitiveUnitType == CSS_RAD
                || m_primitiveUnitType == CSS_GRAD
                || m_primitiveUnitType == CSS_TURN;
     }
     bool isAttr() const { return m_primitiveUnitType == CSS_ATTR; }
     bool isCounter() const { return m_primitiveUnitType == CSS_COUNTER; }
@@ skipping 242 matching lines @@
         Rect* rect;
         Quad* quad;
     } m_value;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSPrimitiveValue, isPrimitiveValue());
 
 } // namespace WebCore
 
 #endif // CSSPrimitiveValue_h