Re: [w3c/ServiceWorker] InstallEvent.addRoutes is resolving/rejecting the returned promise synchronously (Issue #1742)

In the Chromium implementation, Step 6 in https://w3c.github.io/ServiceWorker/#register-router-method is actually done in the browser process because the routing actually happens in the browser process for a main resource navigation.  Since the browser process do not trust the renderer process (and there is mismatch of a regular expression implementation between them), the browser process verifies Step 4 and 5.

However, as you pointed out, the specification is written like as-if Step 6 is a synchronous step.  I am afraid if it can be too much implementation details, but I am happy to update the specification.

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