Make EBorderStyle an enum class.

third_party/WebKit/Source/core/style/BorderStyle.h

Index: third_party/WebKit/Source/core/style/BorderStyle.h
diff --git a/third_party/WebKit/Source/core/style/BorderStyle.h b/third_party/WebKit/Source/core/style/BorderStyle.h
index b243bca03615b4eb68983d57addb6ee5a88d4cff..184ef450ea547a55e7ac22c88267be44776f1eac 100644
--- a/third_party/WebKit/Source/core/style/BorderStyle.h
+++ b/third_party/WebKit/Source/core/style/BorderStyle.h
@@ -37,18 +37,24 @@ class BorderStyle {
   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;
   }
@@ -56,7 +62,7 @@ class BorderStyle {
   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; }