Move rem handling out of CSSParserValues.cpp

Source/core/css/CSSToLengthConversionData.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 90 matching lines @@
 {
     m_style->setHasViewportUnits();
     return std::min(m_viewportSize.width(), m_viewportSize.height()) / 100;
 }
 double CSSToLengthConversionData::viewportMaxPercent() const
 {
     m_style->setHasViewportUnits();
     return std::max(m_viewportSize.width(), m_viewportSize.height()) / 100;
 }
 
+float CSSToLengthConversionData::remFontSize() const
+{
+    m_style->setHasRemUnits();
+    return m_fontSizes.rem();
+}
+
 } // namespace blink