[whatwg/fetch] HTTP-redirect-fetch preserves all pre-redirect headers for post-redirect request (#320)

This means that things like cookie headers are sent along with the redirected request, which is entirely incorrect for cross-origin redirections, for example. Gecko has been very conservative in its implementation of preserving headers across redirections in the past; currently user-set headers (ie. XHR.setRequestHeader) are preserved, but otherwise each request begins with a clean slate.

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