Re: [w3c/payment-handler] window.open not working from paymentrequest eventlistener (#280)

See the source code of https://bobpay.xyz/pay/

```html
<button onclick="pay()">Pay</button>
<script>
let paymentRequestClient;
navigator.serviceWorker.addEventListener('message', e => {
  paymentRequestClient = e.source;
  console.log(JSON.stringify(e.data, undefined, 2));
});
navigator.serviceWorker.controller.postMessage('payment_app_window_ready');
function pay() {
  if(!paymentRequestClient) return;
  var paymentAppResponse = {
    methodName: "https://majaybabu.github.io/payment-handler-pay/",
    details: {
      id: "123456"
    }
  };
  paymentRequestClient.postMessage(paymentAppResponse);
  // Chrome will close this window at this point.
}
</script>
```

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