Re: [ServiceWorker] Serialize the steps of Update/Install/Activate algorithms instead of running them 'atomically' in parallel. (240054c)

@nikhilm @mattto 
I moved the "Pop the top element from .." step to the end of the atomic operation block in Update/Install and removed the "atomically" constraint. This change ensures those code blocks run thread safe. And I also tried to address this comment: https://github.com/slightlyoff/ServiceWorker/issues/461#issue-42936510.

I believe this change does not alter the behavior of the algorithm.

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