Re: [w3c/ServiceWorker] Inconsistencies due to when clients are created (#870)

My suggestion is that these should be the same clientId at the end.

To add some urgency: It's bad that we can't tell if a fetch is targeted at a top-level document or an iframe anymore. The death of `isTopLevel` now appears premature. We had a question just today from a team that influences a notable % of overall web traffic if they could distinguish an iframe navigation for their PWA use-case. It's not possible and it makes their implementation nastier as a result. This is data we _have_. We should be reflecting what we know about the situation to the extent that we can do so safely.

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