There was so much backlash and fearmongering that the were killing ad blockers. But this seems reasonable and there is no discussion on HN regarding this.
One thing to note: if Google gets to decide what is an ad, will they whitelist Adsense ads?
If they just want to protect users, why not introduce these restrictions as a setting that's on by default, but still can be turned off (with a giant fullscreen warning about security and performance, if they wish)? I didn't ask to be protected by Google, so I see these changes only as an attempt to take away control of the browser (which I don't use btw).