Re: [w3c/browser-payment-api] The "if d is resolved" section of updateWith needs to be more explicit about how it gets a PaymentDetails dictionary (#349)

> This isn't taken care of automatically by Web IDL declaring the argument as Promise<PaymentDetails>

Not on its own, no.  You're right that using https://heycam.github.io/webidl/#dfn-perform-steps-once-promise-is-settled would be better; it would also address https://github.com/w3c/browser-payment-api/issues/348

That said, https://heycam.github.io/webidl/#dfn-perform-steps-once-promise-is-settled and https://www.w3.org/2001/tag/doc/promises-guide#shorthand-reacting have different behavior in terms of whether they call the initial value of `then` or not; we should really harmonize them.

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