[fetch] Should fetch(evt.request) send original RequestDestination and RequestType? (#262)

While reviewing some gecko related code I noticed that step 8 of the Request constructor copies most values, but does not copy RequestDestination or RequestType:

  https://fetch.spec.whatwg.org/#dom-request

This means that a service worker that does `fetch(evt.request)` will make a network request with the default destination and type.  This is significant because CSP checking uses these attributes in order to enforce things like child-src, etc.

Is this intentional?  It would seem to break CSP on SW passthrough requests.

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