Bug 1835407 - Remove useless check in style sharing cache. r=dholbert

Useless by the reason described at the end of the comment, we no longer
have such a flag.

Differential Revision: https://phabricator.services.mozilla.com/D179269

servo/components/style/sharing/mod.rs

@@ -879,22 +879,6 @@ impl<E: TElement> StyleSharingCache<E> {
             if target.local_name() != candidate.element.local_name() {
                 return None;
             }
-            // Rule nodes and styles are computed independent of the element's
-            // actual visitedness, but at the end of the cascade (in
-            // `adjust_for_visited`) we do store the visitedness as a flag in
-            // style.  (This is a subtle change from initial visited work that
-            // landed when computed values were fused, see
-            // https://bugzilla.mozilla.org/show_bug.cgi?id=1381635.)
-            // So at the moment, we need to additionally compare visitedness,
-            // since that is not accounted for by rule nodes alone.
-            // FIXME(jryans): This seems like it breaks the constant time
-            // requirements of visited, assuming we get a cache hit on only one
-            // of unvisited vs. visited.
-            // TODO(emilio): We no longer have such a flag, remove this check.
-            if target.is_visited_link() != candidate.element.is_visited_link() {
-                return None;
-            }
-
             Some(data.share_primary_style())
         })
     }