Looks like the server didn’t start. It should happen on all browsers not only on chrome.
Follow the section 1.2.5 of same tutorial and check whether the server starts it’s execution without throwing any error. You should do this:-
$ rails server
=> Booting WEBrick
=> Rails application starting on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server