Re: [whatwg/fetch] propagate request tainted origin flag and/or URL list through service workers (#1335)

So I started working on a pull request to remove the `tainted origin flag` and replace it with an algorithm that operates on the `URL list`.  I realized, though, we can't propagate the `URL list` to a CORS preflight without side effects.  Mainly, it would reduce the redirect count permitted for preflights by however large the original request's `URL list` is.

So I guess for now the easiest thing to do is propagate both the `tainted origin flag` and the `URL list` when constructing an unmodified copy of another request.

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