Make TextDecoration 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 1265 matching lines @@
   }
 
   NOTREACHED();
   return kTextJustifyAuto;
 }
 
 template <>
 inline TextDecoration CSSIdentifierValue::ConvertTo() const {
   switch (value_id_) {
     case CSSValueNone:
-      return kTextDecorationNone;
+      return TextDecoration::kNone;
     case CSSValueUnderline:
-      return kTextDecorationUnderline;
+      return TextDecoration::kUnderline;
     case CSSValueOverline:
-      return kTextDecorationOverline;
+      return TextDecoration::kOverline;
     case CSSValueLineThrough:
-      return kTextDecorationLineThrough;
+      return TextDecoration::kLineThrough;
     case CSSValueBlink:
-      return kTextDecorationBlink;
+      return TextDecoration::kBlink;
     default:
       break;
   }
 
   NOTREACHED();
-  return kTextDecorationNone;
+  return TextDecoration::kNone;
 }
 
 template <>
 inline TextDecorationStyle CSSIdentifierValue::ConvertTo() const {
   switch (value_id_) {
     case CSSValueSolid:
       return kTextDecorationStyleSolid;
     case CSSValueDouble:
       return kTextDecorationStyleDouble;
     case CSSValueDotted:
@@ skipping 2102 matching lines @@
     default:
       break;
   }
   NOTREACHED();
   return kContainsNone;
 }
 
 }  // namespace blink
 
 #endif