Re: [ServiceWorker] A worker that fails to activate should relinquish its controllees (#659)

The current spec makes the SW the "active" worker immediately when activation begins, but it doesn't get any events until it becomes "activated". If activation fails, the registration is left with a null active worker. Chrome additionally unregisters the registration if it has no workers, although that might be a implementation bug.

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https://github.com/slightlyoff/ServiceWorker/issues/659#issuecomment-85768047