The karma on this comment is going up and down like a thing that goes up and down a lot, so I think I should clarify what I meant by "I think Google will block their own ads."

The ad-blocking they're talking about implementing won't block every ad; they said as much. It'll only block the malicious or annoying ads. Google could block those on it's own network already (maybe they already do!). They'll start block them in the Chrome ad-blocking code. That means they'll block their own ads if adSense is serving something that fails their test. They might even use the same "is this ad bad for the user?" heuristics that they use on their servers, effectively meaning Chrome users can benefit from the work they've done in detecting bad adverts even on sites where the site owner has chosen a different ad network. I think that's a good thing.

Whether we'll ever actually see the result of when it comes to an adSense advert is a separate question - it's in Google's interest to block a bad ad at the origin and send a different one instead so they still get paid. That would mean Chrome never actually blocks an adSense advert because they know exactly what won't be displayed and never send anything that would be blocked. I still see that as Google blocking ads on their own network though, just farther up the chain.