[w3c/ServiceWorker] Touching documents in an "in parallel" section makes no sense (#1108)

https://w3c.github.io/ServiceWorker/#client-navigate runs steps in parallel (step 6) that do things like:

> If browsingContext has discarded its Document, reject promise with a TypeError and abort these steps.

But you can't poke that sort of state in an "in parallel" section.  Not least because it can change while the "in parallel" section is running (that's what "in parallel" means).

Of course it can also change before the task queued in step 6 substep 7 runs...

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