freeze break request: gnome-session timeout

[Colin Walters <walters verbum org>]

See: https://bugzilla.gnome.org/show_bug.cgi?id=645650

Very low risk obviously.  We're still trying to debug the ultimate
cause of gnome-settings-daemon hanging, but 10 seconds here just feels
too short, especially after all of what we turned up in
pulseaudio/bluez/dbus interaction.

Would like approval from vuntz here specifically too.