[w3c/ServiceWorker] Clarify "waiting for all" in Install (#1461)

> Wait until e is not active.
> If e’s timed out flag is set, or the result of waiting for all of e’s extend lifetime promises rejected, set installFailed to true.

"waiting for all" (or "get a promise for waiting for all"; #1363) doesn't return a result synchronously, so we can't just check if it rejected. Is this supposed to wait until the promise settles?

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/ServiceWorker/issues/1461