Google does use the "anonymous" usage stats from Chrome to inform AdWords. Source: I personally developed on this feature. Response to rebuttal: the tree you're looking at isn't actually what's complied into the Chrome binary.
I currently work at Google, and from what I know and have seen about how we handle privacy internally I'd be really surprised and appalled if that was the case. Mind sending me more details? My nickname @google.com.
(Given the fact that you use a throwaway account I'm very much not expecting to see anything else than FUD, but hey, I'll give you the benefit of the doubt.)