Auto merge of #17234 - mbrubeck:dir, r=xidorn

stylo: Make :-moz-locale-dir selector non-internal.

https://bugzilla.mozilla.org/show_bug.cgi?id=1367310

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components/style/gecko/non_ts_pseudo_class_list.rs

@@ -117,7 +117,7 @@ macro_rules! apply_non_ts_list {
                 ("lang", Lang, lang, _, _),
             ],
             keyword: [
-                ("-moz-locale-dir", MozLocaleDir, mozLocaleDir, _, PSEUDO_CLASS_INTERNAL),
+                ("-moz-locale-dir", MozLocaleDir, mozLocaleDir, _, _),
                 ("dir", Dir, dir, _, _),
             ]
         }