Make EBoxDecorationBreak 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 797 matching lines @@
     return static_cast<EBoxAlignment>(
         rare_non_inherited_data_->deprecated_flexible_box_->align);
   }
   void SetBoxAlign(EBoxAlignment a) {
     SET_NESTED_VAR(rare_non_inherited_data_, deprecated_flexible_box_, align,
                    a);
   }
 
   // -webkit-box-decoration-break
   static EBoxDecorationBreak InitialBoxDecorationBreak() {
-    return kBoxDecorationBreakSlice;
+    return EBoxDecorationBreak::kSlice;
   }
   EBoxDecorationBreak BoxDecorationBreak() const {
     return static_cast<EBoxDecorationBreak>(box_data_->box_decoration_break_);
   }
   void SetBoxDecorationBreak(EBoxDecorationBreak b) {
     SET_VAR(box_data_, box_decoration_break_, static_cast<unsigned>(b));
   }
 
   // -webkit-box-lines
   static EBoxLines InitialBoxLines() { return SINGLE; }
@@ skipping 2866 matching lines @@
       PseudoBitsInternal() | 1 << (pseudo - kFirstPublicPseudoId)));
 }
 
 inline bool ComputedStyle::HasPseudoElementStyle() const {
   return PseudoBitsInternal() & kElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h