[whatwg/fetch] fetch assumes a url's object is always a Blob (#457)

When it could be a MediaSource or a MediaStream. https://github.com/whatwg/url/commit/1099bb20c056ed5226ee36f20296fe5850fe1cc9 So the following doesn't make sense:

> Append `Content-Length`/blob’s size attribute value to response’s header list.
> Append `Content-Type`/blob’s type attribute value to response’s header list.

What happens if someone tries to fetch one of the other kinds of `blob:` URIs?

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