Delete CHIPS cookies

[bvandersloot-mozilla]

When (deleting cookies)[https://privacycg.github.io/nav-tracking-mitigations/#clear-cookies-for-host], only cookies whose domain key matches are deleted. We should also delete cookies whose partition key is same-site-host with the host to be deleted.

[wanderview]

Just to clarify, the "partition key" is the top-level site in the partitioned case, right? So in "A->B" it refers to the A here? If so, think we implement this but the spec was not updated.

[bvandersloot-mozilla]

That's correct! I expected that was the case.