[CentOS] virt-manager packagekit dependency introduce?

I recently have begun to see this error when starting virt-manager:

Gtk-Message: Failed to load module "pk-gtk-module": libpk-gtk-module.so: cannot open shared object file: No such file or directory

yum whatprovides */libpk-gtk-module.so . . . PackageKit-gtk-module-0.5.8-20.el6.i686 : Install fonts automatically using : PackageKit Repo : base Matched from: Filename : /usr/lib/gtk-2.0/modules/libpk-gtk-module.so

Does anyone know when this dependency was introduced and why was it not satisfied by whatever update introduced it?