Bug#653011:

[Chris Bainbridge]

The solution for XFCE appears to be a patch to xfce4-session and to
enable 'GNOME compatibility mode' by default:

https://bugs.launchpad.net/ubuntu/+source/gnome-keyring/+bug/932177

"What happens is that if gnome-keyring components are not initialized
through XDG autostart any more they will be DBus-activated (see
https://live.gnome.org/GnomeKeyring/RunningDaemon). So when they start
adding back the autostart files for them the warnings will disappear
because there will be no DBus-activation but the SSH/GPG components
will not magically start working outside GNOME. So the only bug here
is that these people are trying to use GNOME keyring without
initializing it properly using the methods I've described before."

"Making it work is relatively simple starting with Xfce 4.10 you just
need to follow https://live.gnome.org/GnomeKeyring/Pam and enable
GNOME compat mode.
For Xfce 4.8 it is more complicated because xfce4-session would need
to be patched with backports of commit
0fea8c64bfc32915d9e397e7029de150167a737d and
67b772364c9e9a7ea9cc4dafb219902c6c8b074a in order to make GNOME compat
mode usable."