Remove unnecessary dependencies

Also a minor note about GroupProgressBar's use of mw.UtilitiesTime.js
which seems superfluous, especially given our moment.js stuff in other
projects.

Change-Id: If01fa647cb88d3e8b648a94dbd8b9625ef69cdd8
Phabricator: http://fab.wmflabs.org/T438
Merge "Remove unnecessary dependencies"