LibWeb: Fix internal logic for recognizing non-abstract ARIA roles

Author: https://github.com/sideshowbarker
Commit: ce65457746
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2964
Reviewed-by: https://github.com/AtkinsSJ ✅

Libraries/LibWeb/ARIA/Roles.h

@@ -128,7 +128,6 @@ bool is_landmark_role(Role);
 bool is_live_region_role(Role);
 bool is_windows_role(Role);
 
-bool is_non_abstract_role(Role);
 bool allows_name_from_content(Role);
 
 }