Make TextEmphasisPosition an enum class.

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

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 1590 matching lines @@
   }
 
   NOTREACHED();
   return kRubyPositionBefore;
 }
 
 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;
   }
 }
 
 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 <>
 inline CSSIdentifierValue::CSSIdentifierValue(TextOverflow overflow)
     : CSSValue(kIdentifierClass) {
   switch (overflow) {
     case kTextOverflowClip:
       value_id_ = CSSValueClip;
       break;
     case kTextOverflowEllipsis:
@@ skipping 1677 matching lines @@
     default:
       break;
   }
   NOTREACHED();
   return kContainsNone;
 }
 
 }  // namespace blink
 
 #endif