Re: [w3c/ServiceWorker] CORS preflight for static import in a module service worker (#1574)

> Do not add the "Service Worker: script" header to import scripts.

We don't add this header to `importScripts()` scripts, so I think this is the right thing to do here too. This means server logs can identify the root of scripts being used as service workers.

Also, right now we're breaking cases where `updateViaCache` is set to "imports", which should signal that the browser can go to the HTTP cache for imports when checking for updates. With modules, we're not treating imports as imports by that definition.

It doesn't look like we're doing the byte-identical check on imported scripts either.

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