Re: [ServiceWorker] should update() during top level script evaluation be ignored? (#800)

I think the easiest way to handle this would be to do something like this in ServiceWorkerRegistration.update():

1. If the entry settings object is a ServiceWorkerGlobalScope (or appropriate text to determine its being called within a service worker).
  1. If the ServiceWorkerGlobalScope's associated service worker's state is 'installing', reject the promise with an InvalidStateError and abort these steps.

Would something like that work?

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