Make ETextModify 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 c3466148e3ae45dd96b879caff0546d977372430..48e02d0416288e50ce6f3442fe5e037263d3943f 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
@@ -1445,13 +1445,13 @@ template <>
 inline CSSIdentifierValue::CSSIdentifierValue(EUserModify e)
     : CSSValue(kIdentifierClass) {
   switch (e) {
-    case READ_ONLY:
+    case EUserModify::kReadOnly:
       value_id_ = CSSValueReadOnly;
       break;
-    case READ_WRITE:
+    case EUserModify::kReadWrite:
       value_id_ = CSSValueReadWrite;
       break;
-    case READ_WRITE_PLAINTEXT_ONLY:
+    case EUserModify::kReadWritePlaintextOnly:
       value_id_ = CSSValueReadWritePlaintextOnly;
       break;
   }
@@ -1461,17 +1461,17 @@ template <>
 inline EUserModify CSSIdentifierValue::ConvertTo() const {
   switch (value_id_) {
     case CSSValueReadOnly:
-      return READ_ONLY;
+      return EUserModify::kReadOnly;
     case CSSValueReadWrite:
-      return READ_WRITE;
+      return EUserModify::kReadWrite;
     case CSSValueReadWritePlaintextOnly:
-      return READ_WRITE_PLAINTEXT_ONLY;
+      return EUserModify::kReadWritePlaintextOnly;
     default:
       break;
   }
 
   NOTREACHED();
-  return READ_ONLY;
+  return EUserModify::kReadOnly;
 }
 
 template <>