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)

I'll use promises guide for now. Using the per-instance `.then` and not handling errors seems bad; I don't think perform steps once a promise is settled is really up to snuff yet. Although we (I) do indeed need to add better promise primitives to Web IDL.

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