They can't just ban the word "Chrome" from AdWords, though. Spammers/malware authors are very good at figuring out what's needed to slip through the automated systems.
They've done this for Skype too. And the funnier thing is when I reported it to Skype, they claimed it was "OK" because it said TOM in the description (Skype's Chinese sponsor). Except the link did not have anything to do with Skype or TOM.