Once `params` are merged into the spec, deprecate the `nonce` parameter

[samuelgoto]

I would recommend removing the nonce parameter entirely in favor of moving all of that kind of thing into a different layer as described in w3c-fedid/FedCM#536.

This suggestion came up here w3c-fedid/FedCM#582 (comment), so kicking this issue off here to track it independently of the other issue.

This is a backwards incompatible change, so requires some thought put into coordinating with existing deployments, but I think is one that is worth pushing through.

Depends on #2 .

[wseltzer]

Discussed at 11 April meeting notes.

[samuelgoto]

• immediately mark nonce deprecated in the spec
• asynchronously, work with existing IdPs that are deploying to move out of using nonce and use params instead.

[wseltzer]

Discussed 8 July.

[pottis]

PR : w3c-fedid/FedCM#762

[npm1]

Plz close since we landed the PR which removes nonce (can't close myself).