Google's trial has "allow on every visit" and "allow this time", but "block on every visit" is conspicuously missing.
Edit: Not sure why I'm being voted down? Can someone who disagrees with my statement explain why you'd click a button with the goal of opening a modal to deny a permission when the permission is already blocked?
Basically, I expect users wil stil need a way to defend against permission spam.
If you're on a site that follows your cursor around with this button forcing you to click on it, the SITE is spam, not the permission request.