Make TextUnderlinePosition an enum class.

third_party/WebKit/Source/core/style/ComputedStyle.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, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1457 matching lines @@
   TextDecorationStyle GetTextDecorationStyle() const {
     return static_cast<TextDecorationStyle>(
         rare_non_inherited_data_->text_decoration_style_);
   }
   void SetTextDecorationStyle(TextDecorationStyle v) {
     SET_VAR(rare_non_inherited_data_, text_decoration_style_, v);
   }
 
   // text-underline-position
   static TextUnderlinePosition InitialTextUnderlinePosition() {
-    return kTextUnderlinePositionAuto;
+    return TextUnderlinePosition::kAuto;
   }
   TextUnderlinePosition GetTextUnderlinePosition() const {
     return static_cast<TextUnderlinePosition>(
         rare_inherited_data_->text_underline_position_);
   }
   void SetTextUnderlinePosition(TextUnderlinePosition v) {
-    SET_VAR(rare_inherited_data_, text_underline_position_, v);
+    SET_VAR(rare_inherited_data_, text_underline_position_,
+            static_cast<unsigned>(v));
   }
 
   // text-decoration-skip
   static TextDecorationSkip InitialTextDecorationSkip() {
     return TextDecorationSkip::kObjects;
   }
   TextDecorationSkip GetTextDecorationSkip() const {
     return static_cast<TextDecorationSkip>(
         rare_inherited_data_->text_decoration_skip_);
   }
@@ skipping 2187 matching lines @@
       PseudoBitsInternal() | 1 << (pseudo - kFirstPublicPseudoId)));
 }
 
 inline bool ComputedStyle::HasPseudoElementStyle() const {
   return PseudoBitsInternal() & kElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h