--- a/layout/style/nsStyleConsts.h
+++ b/layout/style/nsStyleConsts.h
@@ -138,17 +138,16 @@ enum class StyleUserSelect : uint8_t {
   Text,
   Element,
   Elements,
   All,
   Toggle,
   TriState,
   Auto,     // internal value - please use nsFrame::IsSelectable()
   MozAll,   // force selection of all children, unless an ancestor has NONE set - bug 48096
-  MozNone,  // Like NONE, but doesn't change selection behavior for descendants whose user-select is not AUTO.
   MozText,  // Like TEXT, except that it won't get overridden by ancestors having ALL.
 };
 
 // user-input
 #define NS_STYLE_USER_INPUT_NONE      0
 #define NS_STYLE_USER_INPUT_ENABLED   1
 #define NS_STYLE_USER_INPUT_DISABLED  2
 #define NS_STYLE_USER_INPUT_AUTO      3