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

Hacky workaround:

```JS
const response = await request.show();
// sheet is waiting for complete
const didPaySucceed = await fetch("/pay", {method: "POST", body: response.toJSON()});
//... bit's taking ages... so sheet shuts down or user hits "ESC"! 
// finally, we get "didPaySucceed" result.
try {
  // oh crap, invalid state error! The sheet was closed! 
  await request.complete("success");
} catch(err){
  // site: we got this, show success or error.
  displayCompleteResult(didPaySucceed); 
}
```



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