Google's Chrome Security team has taking the wraps of its its latest Pwnium competition. This time out, the target is Chrome OS on a Samsung Series 5 550, and as ever, the company's putting its money (and nerd cred) where its mouth is, offering up a $Pi million in rewards (that's a lofty $3.14159 million) for the third round of the competition. Amongst the payouts are $110,000 for a "browser or system level compromise in guest mode or as a logged-in user, delivered via a web page" and $150,000 for a "compromise with device persistence -- guest to