factor out start_gnome_contacts()
factor out start_gnome_contacts()

https://bugzilla.gnome.org/show_bug.cgi?id=669578

GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets