Remove value packing and custom style building for text-underline-position.

Source/core/rendering/style/RenderStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 327 matching lines @@
 enum TextAlignLast {
     TextAlignLastAuto, TextAlignLastStart, TextAlignLastEnd, TextAlignLastLeft, TextAlignLastRight, TextAlignLastCenter, TextAlignLastJustify
 };
 
 enum TextJustify {
     TextJustifyAuto, TextJustifyNone, TextJustifyInterWord, TextJustifyDistribute
 };
 
 enum TextUnderlinePosition {
     // FIXME: Implement support for 'under left' and 'under right' values.
-    TextUnderlinePositionAuto = 0x1,
-    TextUnderlinePositionUnder = 0x2
+    TextUnderlinePositionAuto,
+    TextUnderlinePositionUnder
 };
 
 enum EPageBreak {
     PBAUTO, PBALWAYS, PBAVOID
 };
 
 enum EEmptyCell {
     SHOW, HIDE
 };
 
@@ skipping 180 matching lines @@
 static const float maximumAllowedFontSize = 1000000.0f;
 
 enum TextIndentLine { TextIndentFirstLine, TextIndentEachLine };
 enum TextIndentType { TextIndentNormal, TextIndentHanging };
 
 enum CSSBoxType { BoxMissing = 0, MarginBox, BorderBox, PaddingBox, ContentBox };
 
 } // namespace blink
 
 #endif // RenderStyleConstants_h