Both those pages are out of date (and I have just unlinked the xmonad wiki one, replacing it with a stub MATE page which is not yet complete but will probably work if you don't mind losing the standard MATE session).

Gnome 3 > 3.8 does not work with any window manager other than gnome-shell. It is increasingly difficult to backport gnome-flashback, which creates a Gnome 2 environment with a Gnome 3-like theme.

The closest you can get to the old Gnome 2 integration is to integrate with MATE. Gnome 3 is not possible, for xmonad or any other window manager.