I doubt anybody reading this site would click on something like this that just popped up on their browser.
Chrome updates itself in the background. It looks like this malware downloader is coming through compromised advertising on a web site. I’ve seen it maybe 4 times, and my wife caught it once.
I wouldn’t have mentioned it here except that I found this one at the Post & Email. It’s also appearing at reddit, Facebook and Yahoo mail. There is an extensive discussion of it on the Google product forums, and it is not to be taken lightly.