In bug 689638, the designers only asked for the list icons
to be symbolic, not the big icons in the page headings. The
current code was failing on both ends: virtual devices like
vlan still had non-symbolic icons in the list, and several
pages (e.g mobile and proxy) had symbolic icons in the headings.
https://bugzilla.gnome.org/show_bug.cgi?id=693001
This is consistent with the guideline to use symbolic icons for
classes and reserve full color icons for "things" like apps, people,
documents, pages, etc.
It is also consistent with how these devices are displayed in the
network menu, notifications, and dialogs.
https://bugzilla.gnome.org/show_bug.cgi?id=689638
Unfortunately, the VPN plugins provide their own .ui files for their
editor pages, so we can't make them look competely GNOME-3-ish. But
the code does try to fix them up a little bit by realigning the
labels.
vpn-helpers.[ch] is nearly identical to network-manager-applet's,
but eventually this code will move into libnm-gtk.
https://bugzilla.gnome.org/show_bug.cgi?id=691285
