Make EBorderStyle an enum class.

third_party/WebKit/Source/core/layout/CollapsedBorderValue.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 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
  * License as published by the Free Software Foundation; either
@@ skipping 30 matching lines @@
 };
 
 class CollapsedBorderValue {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 
  public:
   // Constructs a CollapsedBorderValue for non-existence border.
   CollapsedBorderValue()
       : color_(0),
         width_(0),
-        style_(kBorderStyleNone),
+        style_(static_cast<unsigned>(EBorderStyle::kNone)),
         precedence_(kBorderPrecedenceOff) {}
 
   CollapsedBorderValue(const BorderValue& border,
                        const Color& color,
                        EBorderPrecedence precedence)
       : color_(color),
-        width_(border.Style() > kBorderStyleHidden ? border.Width() : 0),
-        style_(border.Style()),
+        width_(border.Style() > EBorderStyle::kNone ? border.Width() : 0),
+        style_(static_cast<unsigned>(border.Style())),
         precedence_(precedence) {
     DCHECK(precedence != kBorderPrecedenceOff);
   }
 
   unsigned Width() const { return width_; }
   EBorderStyle Style() const { return static_cast<EBorderStyle>(style_); }
   bool Exists() const { return precedence_ != kBorderPrecedenceOff; }
   Color GetColor() const { return color_; }
   bool IsTransparent() const { return !color_.Alpha(); }
   EBorderPrecedence Precedence() const {
@@ skipping 22 matching lines @@
  private:
   Color color_;
   unsigned width_ : 25;
   unsigned style_ : 4;       // EBorderStyle
   unsigned precedence_ : 3;  // EBorderPrecedence
 };
 
 }  // namespace blink
 
 #endif  // CollapsedBorderValue_h