Re: [w3c/payment-request] Response timeout could leave page/user in confused state. (#737)

Could we allow `complete()` to accept a `Promise`.

The `Promise` returned by `complete()` could resolve/reject based on that Promise (and to the same value).

A developer with long running login that they must perform (even a chain of async calls) can wrap these behind a Promise and pass to `complete()`. If `complete()` is passed a promise it should never timeout.

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