MarsSeed [1] filed a deletion request for libva-vdpau-driver-chromium [2]: This variant of extra repo's libva-vdpau-driver is no longer needed or used by chromium or any other packages.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libva-vdpau-driver-chromium/
