LibWeb: Add missing cookie-age-limit steps to CookieStore::set()

Author: https://github.com/IdanHo
Commit: 73266c8498
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5946
Reviewed-by: https://github.com/trflynn89 ✅

Libraries/LibWeb/Cookie/ParsedCookie.h

@@ -33,6 +33,8 @@ WEB_API bool cookie_contains_invalid_control_character(StringView);
 WEB_API bool domain_matches(StringView string, StringView domain_string);
 WEB_API String default_path(URL::URL const&);
 
+constexpr inline AK::Duration maximum_cookie_age = AK::Duration::from_seconds(400LL * 24 * 60 * 60);
+
 }
 
 namespace IPC {