LibWebView+RequestServer: Add some UI for DNS settings

Author: https://github.com/alimpfard
Commit: 2c13504bfc
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4278
Reviewed-by: https://github.com/trflynn89 ✅

Libraries/LibWebView/WebUI/SettingsUI.h

@@ -35,6 +35,8 @@ private:
     void remove_all_site_setting_filters(JsonValue const&);
 
     void set_do_not_track(JsonValue const&);
+
+    void set_dns_settings(JsonValue const&);
 };
 
 }