Make TextEmphasisPosition 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 6c07e882094a867bbe045319a66bc9cf7dfbe742..85ea4d830eeefc1a41d025e8a80becb378a69475 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
@@ -1608,10 +1608,10 @@ template <>
 inline CSSIdentifierValue::CSSIdentifierValue(TextEmphasisPosition position)
     : CSSValue(kIdentifierClass) {
   switch (position) {
-    case kTextEmphasisPositionOver:
+    case TextEmphasisPosition::kOver:
       value_id_ = CSSValueOver;
       break;
-    case kTextEmphasisPositionUnder:
+    case TextEmphasisPosition::kUnder:
       value_id_ = CSSValueUnder;
       break;
   }
@@ -1621,15 +1621,15 @@ template <>
 inline TextEmphasisPosition CSSIdentifierValue::ConvertTo() const {
   switch (value_id_) {
     case CSSValueOver:
-      return kTextEmphasisPositionOver;
+      return TextEmphasisPosition::kOver;
     case CSSValueUnder:
-      return kTextEmphasisPositionUnder;
+      return TextEmphasisPosition::kUnder;
     default:
       break;
   }
 
   NOTREACHED();
-  return kTextEmphasisPositionOver;
+  return TextEmphasisPosition::kOver;
 }
 
 template <>