Remove unused admin/projects#repository method
requested to merge github/fork/cirosantilli/rm-duplicate-derived-admin-repository-method into master
Created by: cirosantilli
Already defined on the ApplicationController base class at: https://github.com/gitlabhq/gitlabhq/blob/3880bb61760ef1f69b0df49148202ff6b4208f01/app/controllers/application_controller.rb#L108