Make RubyPosition 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 1792 matching lines @@
   // -webkit-line-clamp
   static LineClampValue InitialLineClamp() { return LineClampValue(); }
   const LineClampValue& LineClamp() const {
     return rare_non_inherited_data_->line_clamp;
   }
   void SetLineClamp(LineClampValue c) {
     SET_VAR(rare_non_inherited_data_, line_clamp, c);
   }
 
   // -webkit-ruby-position
-  static RubyPosition InitialRubyPosition() { return kRubyPositionBefore; }
+  static RubyPosition InitialRubyPosition() { return RubyPosition::kBefore; }
   RubyPosition GetRubyPosition() const {
     return static_cast<RubyPosition>(rare_inherited_data_->ruby_position_);
   }
   void SetRubyPosition(RubyPosition position) {
-    SET_VAR(rare_inherited_data_, ruby_position_, position);
+    SET_VAR(rare_inherited_data_, ruby_position_,
+            static_cast<unsigned>(position));
   }
 
   // -webkit-tap-highlight-color
   static Color InitialTapHighlightColor();
   Color TapHighlightColor() const {
     return rare_inherited_data_->tap_highlight_color_;
   }
   void SetTapHighlightColor(const Color& c) {
     SET_VAR(rare_inherited_data_, tap_highlight_color_, c);
   }
@@ skipping 1916 matching lines @@
       PseudoBitsInternal() | 1 << (pseudo - kFirstPublicPseudoId)));
 }
 
 inline bool ComputedStyle::HasPseudoElementStyle() const {
   return PseudoBitsInternal() & kElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h