/usr/lib/ is in ruby-hipchat 1.5.2-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/hipchat/
/usr/lib/ruby/vendor_ruby/hipchat/api_version.rb
/usr/lib/ruby/vendor_ruby/hipchat/capistrano/
/usr/lib/ruby/vendor_ruby/hipchat/capistrano/tasks/
/usr/lib/ruby/vendor_ruby/hipchat/capistrano/tasks/hipchat.rake
/usr/lib/ruby/vendor_ruby/hipchat/capistrano.rb
/usr/lib/ruby/vendor_ruby/hipchat/capistrano2.rb
/usr/lib/ruby/vendor_ruby/hipchat/chef.rb
/usr/lib/ruby/vendor_ruby/hipchat/client.rb
/usr/lib/ruby/vendor_ruby/hipchat/errors.rb
/usr/lib/ruby/vendor_ruby/hipchat/file_helper.rb
/usr/lib/ruby/vendor_ruby/hipchat/rails3_tasks.rb
/usr/lib/ruby/vendor_ruby/hipchat/railtie.rb
/usr/lib/ruby/vendor_ruby/hipchat/room.rb
/usr/lib/ruby/vendor_ruby/hipchat/user.rb
/usr/lib/ruby/vendor_ruby/hipchat/version.rb
/usr/lib/ruby/vendor_ruby/hipchat.rb