style: Introduce Chrome UI privilege for parsers

The motivation is that Chrome XBL stylesheets can be parsed under author
level, but we allow some event-state pseudo classes like
:-moz-handled-clicktoplay to be used.

Also synchronize the privilege of pseudo classes in
non_ts_pseudo_class_list.rs and nsCSSPseudoClassList.h (except :fullscreen).

MozReview-Commit-ID: 8fUjjC8hbQO

tests/unit/style/parsing/selectors.rs

@@ -14,6 +14,7 @@ fn parse_selector<'i, 't>(input: &mut Parser<'i, 't>) -> Result<SelectorList<Sel
     let parser = SelectorParser {
         stylesheet_origin: Origin::UserAgent,
         namespaces: &ns,
+        url_data: None,
     };
     SelectorList::parse(&parser, input)
 }