Re: [ServiceWorker] Invoke the has focus steps instead of hasFocus() method directly. Fixes #633. (3d0ee14)

The Capture Window Client algorithm is supposed to run in a task consumed by the client's responsible event loop. The callers invoking it are queuing a task already. A missing bit is I'm running it off the main thread in Clients.matchAll(). https://github.com/slightlyoff/ServiceWorker/issues/672 tracks that.

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