Re: [fetch] Use the URL from the response, if it has one (#146)

I don't actually see where Response's url list is set with the URL from a network load.  Is it implied in step 4 of HTTP-network fetch?

> Let response be the result of making an HTTP request over connection using request, following the relevant requirements from HTTP, and waiting until all the headers are transmitted or fetch is being terminated with reason reason. If fetch is being terminated, set response's termination reason to reason.

Since we're making this logic dependent on response url list being set, we should be explicit about where it is it I think.

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