[Spec] Integrate network revocation with credentialless iframes

[blu25]

https://wicg.github.io/anonymous-iframe/#dom-window-credentialless

Credentialless iframes' partitions are determined by a page credentialless nonce, which is unique to each top-level window.

We need to extend our network revocation algorithm to revoke network access for the page credentialless nonce on top of the existing fenced frame partition nonce.

This can be done simply by calling the new [=revoke network for a partition nonce=] algorithm on the relevant window's page credentialless nonce where the current TODO is in #169.

[domfarolino]

Please describe what "integrate" means? What needs to be done? Is there some processing model in that spec that we need to monkeypatch or invoke in a special way with fenced frames? Please make the OP text of this issue actionable with a problem statement and rough solution thoughts.