Re: [fetch] Redirect handling is wrong for opaqueredirect (#212)

I guess the only case where we could not use the response URL would be a synthetic response. However, it would be fine with me if in that scenario a non-relative `Location` would simply fail.

If you use `Response.redirect()` to create this synthetic response by the way we get the base URL from script so that will not be affected. It only affects synthetic redirect responses created from scratch.

So that all seems pretty great. Another victory for the response URL.

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