Re: [w3c/ServiceWorker] Disallow waitUntil() of manually constructed events (#1166)

@jakearchibald, I added a guard to prevent the script created event from extending the lifetime via waitUntil(). There's a test already: https://github.com/w3c/web-platform-tests/blob/master/service-workers/service-worker/resources/extendable-event-async-waituntil.js#L45. But I tried to update it to make the isTrusted test independant from other conditions. Please take a look.

Chrome implemented this by checking whether the event is implementing the internal observer structure instead of directly using isTrusted state. (@mattto, I can change this to using isTrusted if you think that makes sense.)

/cc @wanderview, @mattto 

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