[w3c/payment-request] Do we need "doc is fully active" checks on `response.complete()`? (#731)

@domenic can you sanity check something for me... we don't currently check if document is "fully active" on `response.complete()`. 

But, in theory:

```JS
const iframe = getSomeIframe();
const response = await getResponseFrom(iframe);
await response.retry({});
await new Promise(resolve => {
  iframe.onload = resolve;
  iframe.src = "some/new/location";
}
// oh noes!
await response.complete("success"); // <- should probably reject, invalid state?. 
```

Similarly:

```JS
const iframe = getSomeIframe();
const response = await getResponseFrom(iframe);
await response.retry({});
const completePromise = response.complete("success");
await new Promise(resolve => {
  iframe.onload = resolve;
  iframe.src = "some/new/location";
}
await completePromise; // <- should probably reject, invalid state?
```


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