GNOME Shell is a core component of the desktop rather than a utility, so adjust the desktop file to reflect that. https://bugzilla.gnome.org/show_bug.cgi?id=640688
Add a desktop file for GNOME Shell. This allows making GNOME Shell your desktop default by adding it to your auto-start items. http://bugzilla.gnome.org/show_bug.cgi?id=591089