Re: [ServiceWorker] Support module service workers, and update for ES6 (#831)

1. The redirect mode should be "error" for fetching service workers, not "manual".
2. I prefer not doing tight coupling of type/destination with other features of request inside Fetch. It's less modular. We haven't even done that for mode "navigate" (redirect mode is set to "manual" by HTML for that).

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https://github.com/slightlyoff/ServiceWorker/issues/831#issuecomment-187609734