allow media queries to contain a single identifier wrapped in parens

src/parse/media.rs

@@ -58,7 +58,7 @@ impl<'a> Parser<'a> {
                     self.toks.next();
                     self.toks.next();
                 }
-                '>' | '<' | ':' => {
+                '>' | '<' | ':' | ')' => {
                     break;
                 }
                 _ => {

tests/media.rs

@@ -49,3 +49,8 @@ test!(
     }",
     "@media print and (foo: 1 2 3) {\n  a {\n    color: red;\n  }\n}\n"
 );
+test!(
+    single_identifier_inside_parens,
+    "@media (color) {a {color: red;}}",
+    "@media (color) {\n  a {\n    color: red;\n  }\n}\n"
+);