We must surf different webs. I rarely see messages like this these days.
I suspect a "This site only works with chrome!" message only applies to older versions of Internet Explorer.
Crying wolf is so boring these days.
edit: Also i find it hilarious that you think Google would risk rejecting all users who aren't using Chrome. Talk about a great way to give your Search competition a legitimate case.
edit2: The downvoting is cute, and i hope it's because of my tone and not me calling out lies. "Anything but Chrome!" he says - absurd. By all means, downvote my tone, but i should hope outright lying gets similar treatment.
I see it often on Firefox, I have the latest Firefox on linux (35.0.1). It's a blue bar along the top of many Google properties that are decently cross browser. Go to Inbox without chrome and you'll see the "only works with chrome" crap.
The biggest difference is probably NaCl in Chrome right now.
It shows on old Opera (Presto), new Opera (Blink) and IE 11, so it's not just old versions of IE.