MarsSeed [1] filed a deletion request for polkit-gnome-gtk2 [2]: EOL version from 2011, no longer needed. There's no functional GNOME2 desktop or any other Gtk2 based desktop on AUR anymore.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/polkit-gnome-gtk2/
