/usr/lib/ruby/vendor_ruby/ is in ruby-web-console 2.2.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/web-console.rb
/usr/lib/ruby/vendor_ruby/web_console.rb
/usr/lib/ruby/vendor_ruby/web_console/
/usr/lib/ruby/vendor_ruby/web_console/evaluator.rb
/usr/lib/ruby/vendor_ruby/web_console/errors.rb
/usr/lib/ruby/vendor_ruby/web_console/whitelist.rb
/usr/lib/ruby/vendor_ruby/web_console/templates/
/usr/lib/ruby/vendor_ruby/web_console/templates/console.js.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/index.html.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/_inner_console_markup.html.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/_prompt_box_markup.html.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/_markup.html.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/error_page.js.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/style.css.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/layouts/
/usr/lib/ruby/vendor_ruby/web_console/templates/layouts/javascript.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/layouts/inlined_string.erb
/usr/lib/ruby/vendor_ruby/web_console/templates/main.js.erb
/usr/lib/ruby/vendor_ruby/web_console/session.rb
/usr/lib/ruby/vendor_ruby/web_console/middleware.rb
/usr/lib/ruby/vendor_ruby/web_console/request.rb
/usr/lib/ruby/vendor_ruby/web_console/integration/
/usr/lib/ruby/vendor_ruby/web_console/integration/cruby.rb
/usr/lib/ruby/vendor_ruby/web_console/integration/rubinius.rb
/usr/lib/ruby/vendor_ruby/web_console/integration/jruby.rb
/usr/lib/ruby/vendor_ruby/web_console/tracer.rb
/usr/lib/ruby/vendor_ruby/web_console/railtie.rb
/usr/lib/ruby/vendor_ruby/web_console/integration.rb
/usr/lib/ruby/vendor_ruby/web_console/whiny_request.rb
/usr/lib/ruby/vendor_ruby/web_console/helper.rb
/usr/lib/ruby/vendor_ruby/web_console/template.rb
/usr/lib/ruby/vendor_ruby/web_console/extensions.rb
/usr/lib/ruby/vendor_ruby/web_console/version.rb