Make TextDecorationSkip an enum class.

third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h

Index: third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
diff --git a/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h b/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
index ef50851e579e859a84e8da399bba326ddd370bbd..eb6a889772f60930c9152e10ef23eaa0d5978d9e 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
@@ -1264,15 +1264,15 @@ template <>
 inline TextDecorationSkip CSSIdentifierValue::ConvertTo() const {
   switch (value_id_) {
     case CSSValueObjects:
-      return kTextDecorationSkipObjects;
+      return TextDecorationSkip::kObjects;
     case CSSValueInk:
-      return kTextDecorationSkipInk;
+      return TextDecorationSkip::kInk;
     default:
       break;
   }
 
   NOTREACHED();
-  return kTextDecorationSkipObjects;
+  return TextDecorationSkip::kObjects;
 }
 
 template <>