FYI I've posted about this issue on Google Chrome forum:
http://www.google.com/support/forum/p/Chrome/thread?tid=7d50c093bd4f8f6c...

And Cherokee server mailing list:
http://cherokee-web-server-general.1049476.n5.nabble.com/Google-Chrome-f...

So that might help some people.

Even though this technically might not be an Ubercart problem, I still can't help wondering WHY ajax calls are truly necessary in this section of Ubercart.
Seems to be asking for trouble, and why assume all buyers have javascript enabled?