Seeing as gnome-user-share is required for receiving files in GNOME 3 via bluetooth (but not sending them), it's requirements on apache shouldn't be mandatory. Unmerging apache while gnome-user-share is installed doesn't break anything or cause GNOME to throw any errors and doesn't prevent portage from emerging gnome-user-share, the only thing that doesn't work of course is the ability to do webdav sharing from the GUI. This does bring in one problem; gnome stays silent when apache isn't installed and a user tries to enable file sharing. So, to get rid of gnome-user-share's mandatory dependency on Apache, I'd like to request that a USE flag be added to the ebuild that's enabled by default called 'webdav' that toggles the dependency on apache and www-apache/mod_dnssd.
*** This bug has been marked as a duplicate of bug 551012 ***