This method was removed in mutter, its async promisification is not
necessary anymore.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/4068>
Gio._promisify(Polkit.Permission, 'new');
Gio._promisify(Shell.App.prototype, 'activate_action');
Gio._promisify(Meta.Backend.prototype, 'set_keymap_async');
-Gio._promisify(Meta.Backend.prototype, 'set_keymap_layout_group_async');
// We can't import shell JS modules yet, because they may have
// variable initializations, etc, that depend on this file's