*** NOT FOR LANDING *** Unprefix multicol behind a flag

Source/core/css/StylePropertySerializer.cpp

Index: Source/core/css/StylePropertySerializer.cpp
diff --git a/Source/core/css/StylePropertySerializer.cpp b/Source/core/css/StylePropertySerializer.cpp
index 2a0095a41d56fc5071da4b11ecee5277f8212cab..4f63dd63d3e599dd2163cf7b8ff307f33ae6fd3a 100644
--- a/Source/core/css/StylePropertySerializer.cpp
+++ b/Source/core/css/StylePropertySerializer.cpp
@@ -408,10 +408,10 @@ String StylePropertySerializer::getPropertyValue(CSSPropertyID propertyID) const
         return get4Values(borderWidthShorthand());
     case CSSPropertyBorderStyle:
         return get4Values(borderStyleShorthand());
-    case CSSPropertyWebkitColumnRule:
-        return getShorthandValue(webkitColumnRuleShorthand());
-    case CSSPropertyWebkitColumns:
-        return getShorthandValue(webkitColumnsShorthand());
+    case CSSPropertyColumnRule:
+        return getShorthandValue(columnRuleShorthand());
+    case CSSPropertyColumns:
+        return getShorthandValue(columnsShorthand());
     case CSSPropertyFlex:
         return getShorthandValue(flexShorthand());
     case CSSPropertyFlexFlow: