stylo: Remove the visited bit for now since it doesn't account for th…

…e pref.

I'll fix before landing the Gecko changes for bug 1383307, so this doesn't break
anything yet.

ports/geckolib/glue.rs

@@ -1737,7 +1737,8 @@ pub extern "C" fn Servo_ComputedValues_GetStyleBits(values: ServoStyleContextBor
     let flags = values.flags;
     let mut result = 0;
     if flags.contains(IS_RELEVANT_LINK_VISITED) {
-        result |= structs::NS_STYLE_RELEVANT_LINK_VISITED as u64;
+        // FIXME(emilio): This doesn't account for the pref.
+        // result |= structs::NS_STYLE_RELEVANT_LINK_VISITED as u64;
     }
     if flags.contains(HAS_TEXT_DECORATION_LINES) {
         result |= structs::NS_STYLE_HAS_TEXT_DECORATION_LINES as u64;