Make TextDecorationSkip an enum class.

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

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index 43a50f38e72e63e93ccdbaceed4dc926c299b7ea..d6abe35ddd7edf46c44723cf45c65f645293ee92 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -1433,14 +1433,15 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase<ComputedStyle>,
 
   // text-decoration-skip
   static TextDecorationSkip InitialTextDecorationSkip() {
-    return kTextDecorationSkipObjects;
+    return TextDecorationSkip::kObjects;
   }
   TextDecorationSkip GetTextDecorationSkip() const {
     return static_cast<TextDecorationSkip>(
         rare_inherited_data_->text_decoration_skip_);
   }
   void SetTextDecorationSkip(TextDecorationSkip v) {
-    SET_VAR(rare_inherited_data_, text_decoration_skip_, v);
+    SET_VAR(rare_inherited_data_, text_decoration_skip_,
+            static_cast<unsigned>(v));
   }
 
   // text-overflow