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

A note on Chrome's implementation: the comment in the Blink's test is misleading:
```// update() during the script evaluation should be ignored.```

Chrome actually can perform update() during initial script evaluation. It only ignores it if Get Newest Worker returns null. The comment means to say something like "update() from the installing worker of a new registration is rejected with InvalidStateError".

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https://github.com/slightlyoff/ServiceWorker/issues/800#issuecomment-173859798