Refactor unitTable access

Source/core/css/parser/MediaQueryToken.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/parser/MediaQueryToken.h"
 
 #include "wtf/HashMap.h"
 #include "wtf/text/StringHash.h"
 
@@ skipping 31 matching lines @@
     , m_numericValue(numericValue)
     , m_unit(CSSPrimitiveValue::CSS_NUMBER)
 {
     ASSERT(type == NumberToken);
 }
 
 void MediaQueryToken::convertToDimensionWithUnit(String unit)
 {
     ASSERT(m_type == NumberToken);
     m_type = DimensionToken;
-    m_unit = CSSPrimitiveValue::getUnitTable().get(unit.lower());
+    m_unit = CSSPrimitiveValue::fromName(unit);
 }
 
 void MediaQueryToken::convertToPercentage()
 {
     ASSERT(m_type == NumberToken);
     m_type = PercentageToken;
     m_unit = CSSPrimitiveValue::CSS_PERCENTAGE;
 }
 
 } // namespace WebCore