Re: [w3c/ServiceWorker] Improve handling of extend lifetime promises (#1049)

This doesn't appear to be a good idea. I'm not sure what is trying to be accomplished, but as specced this means that given

```js
const p = getSomePromise();
const q = p.then(doSomething);
e.waitUntil(p);
const r = p.then(doSomethingElse);
```

will only wait on `p` and `q` but not `r`, which seems surprising. I would suggest trying to find some approach that does not look at [[PromiseFulfillReactions]] at all. Maybe just looking at `p` is sufficient, in this example, since `p` is what you actually are passing to `waitUntil`.

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