Re: [w3c/permissions] Handle non-fully-active documents (#162)

@jyasskin, @rakina, yes, you are right. In [reading the current permission state](https://w3c.github.io/permissions/#reading-current-states), we can check if the |document| is "fully active" (and reject at that point?).

Concretely in JS below.

 * Chrome: resolves the promise with `undefined`. 
 * Firefox: never resolves. 
 
```JS
async function test() {
  const iframe = await loadIframe();
  // Prevent GC from collecting the permissions object.
  const permissions = iframe.contentWindow.navigator.permissions;

  // Make iframe no longer fully active
  iframe.remove();

  // Deny or throw?
  const perm = await permissions.query({
    name: "geolocation",
  });

  console.assert(
    perm.state === "denied",
    "Expected permission state to be 'denied'"
  );
}

async function loadIframe() {
  const iframe = document.createElement("iframe");
  iframe.src = "/";
  document.body.appendChild(iframe);
  await new Promise((resolve) => {
    iframe.onload = resolve;
  });
  return iframe;
}

test();
``` 


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