Make EBorderStyle an enum class.

third_party/WebKit/Source/core/style/BorderStyle.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 19 matching lines @@
 #include "platform/graphics/Color.h"
 #include "platform/wtf/Allocator.h"
 
 namespace blink {
 
 class BorderStyle {
   DISALLOW_NEW();
   friend class ComputedStyle;
 
  public:
-  BorderStyle() : style_(kBorderStyleNone), is_auto_(kOutlineIsAutoOff) {}
+  BorderStyle()
+      : style_(static_cast<unsigned>(EBorderStyle::kNone)),
+        is_auto_(kOutlineIsAutoOff) {}
 
-  bool NonZero() const { return (style_ != kBorderStyleNone); }
+  bool NonZero() const {
+    return (style_ != static_cast<unsigned>(EBorderStyle::kNone));
+  }
 
   bool operator==(const BorderStyle& o) const { return style_ == o.style_; }
 
   // The default width is 3px, but if the style is none we compute a value of 0
   // (in ComputedStyle itself)
   bool VisuallyEqual(const BorderStyle& o) const {
-    if (style_ == kBorderStyleNone && o.style_ == kBorderStyleNone)
+    if (style_ == static_cast<unsigned>(EBorderStyle::kNone) &&
+        o.style_ == static_cast<unsigned>(EBorderStyle::kNone))
       return true;
-    if (style_ == kBorderStyleHidden && o.style_ == kBorderStyleHidden)
+    if (style_ == static_cast<unsigned>(EBorderStyle::kHidden) &&
+        o.style_ == static_cast<unsigned>(EBorderStyle::kHidden))
       return true;
     return *this == o;
   }
 
   bool operator!=(const BorderStyle& o) const { return !(*this == o); }
 
   EBorderStyle Style() const { return static_cast<EBorderStyle>(style_); }
-  void SetStyle(EBorderStyle style) { style_ = style; }
+  void SetStyle(EBorderStyle style) { style_ = static_cast<unsigned>(style); }
 
   OutlineIsAuto IsAuto() const { return static_cast<OutlineIsAuto>(is_auto_); }
   void SetIsAuto(OutlineIsAuto is_auto) { is_auto_ = is_auto; }
 
  protected:
   unsigned style_ : 4;  // EBorderStyle
 
   // This is only used by OutlineValue but moved here to keep the bits packed.
   unsigned is_auto_ : 1;  // OutlineIsAuto
 };
 
 }  // namespace blink
 
 #endif  // BorderStyle_h