[w3c/ServiceWorker] https://w3c.github.io/ServiceWorker/#client-navigate is synchronously accessing to a client active service worker (Issue #1638)

Step 4 of the navigate algorithm:
`If this's associated service worker client's active service worker is not this's relevant global object’s service worker, return a promise rejected with a TypeError.`

This step is done synchronously in the service worker's thread.
I would expect this check to be done within a 'run in parallel' block since it is difficult to know from a service worker whether a client is controlled or not.

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