Re: [ServiceWorker] Navigating clients from the SW context? (#681)

@jakearchibald Looks good. I just tweaked step 4 (links to concepts) and step 6.3.4 (variable). And added step 6.3.2 for https://github.com/slightlyoff/ServiceWorker/issues/694#issuecomment-103627523.

> I'm uncomfortable with the "source browsing context" bit, as it's a lie, but I think this is the first API that lets a non-browsing context navigate a browsing context.

This seems fine to me since the _browsingContext_ there is actually a browsing context gotten from a service worker client's global object.

> I'm checking that the document hasn't been discarded (1.6.2), should focus() do the same?

FWIW, `focus()` still should work even if the browsing context discards its document?

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