Minor style nit.

src/css.hh

@@ -406,12 +406,13 @@ class MatchCache : public lout::misc::SimpleVector <int> {
  */
 class CssSelector {
    public:
-      typedef enum {
+      enum Combinator
+      {
          COMB_NONE,
          COMB_DESCENDANT,
          COMB_CHILD,
          COMB_ADJACENT_SIBLING
-      } Combinator;
+      };
 
    private:
       struct CombinatorAndSelector {