[ServiceWorker] Unregister algorithm step 6.1 is no longer necessary (#855)

Step 6.1 of the Unregister algorithm is:

> If registration’s uninstalling flag is unset, invoke Finish Job with job and abort these steps. 

I don't think this can ever be true now, though.  The uninstalling flag is not cleared in the Register algorithm which executes within a job.  Since we have a single job queue the flag cannot be cleared until the Unregister job completes.

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