The previous wrapping code hardcoded a width in pixels, making it
non-text-zoom-friendly. Specify a CSS width in pts, and fix the
userMenu code to completely opt out of the popupMenu column behavior.
Hack PopupComboBoxMenuItem slightly to deal with the fact that the
pop-up no longer gets setColumnWidth'ed.
https://bugzilla.gnome.org/show_bug.cgi?id=652837