[whatwg/fetch] Change how CORS filtered response filters the headers. (#265)

Rather than just directling taking the exposed headers from the
`Access-Control-Expose-Headers` header, this adds a separate list of
exposed headers to a response, initialized from that header. This makes
it possible for foreign fetch to filter headers differently.

This will be used by foreign fetch in mkruisselbrink/ServiceWorker@bf4585bc6afb9e0b1cefdeff97f69595545a1af4
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/265

-- Commit Summary --

  * Change how CORS filtered response filters the headers.

-- File Changes --

    M Overview.html (29)
    M Overview.src.html (33)

-- Patch Links --

https://github.com/whatwg/fetch/pull/265.patch
https://github.com/whatwg/fetch/pull/265.diff

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