In the new gnome-shell, otherwise known as Gnome 3, there is an accessibility menu called “Universal Access” that cannot be removed by any apparent means. Fortunately it can easily be removed, hidden, or disabled by editing a file and restarting the shell. This method works for gnome-shell version 3.0 (this reportedly works in Gnome 3.2 as well), it may or may not work in future versions.
sudo apt-get update
sudo apt-get install gnome-shell-extensions-noa11y
Edit the file /usr/share/gnome-shell/js/ui/panel.js
Look for the following line, (line 38 in my case):
Comment out this line like so:
Then restart gnome-shell by typing Alt-F2 to run command, enter “r” without the quotes, and hit enter. This will quickly restart the shell and you should find that the Universal Access menu no longer appears. If you should find a use for it in the future, simply un-comment the lines found in /usr/share/gnome-shell/js/ui/panel.js
Thanks to the endlessly helpful folks who maintain ArchWiki for this tip.