[whatwg/fetch] Define preconnect and dns-prefetch with CSP (PR #1620)

Preconnect & dns-prefetch test a fake prefetch request for CSP, and then obtain a connection/resolve an origin.

See whatwg/html#9035

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1620

-- Commit Summary --

  * Define preconnect and dns-prefetch with CSP

-- File Changes --

    M fetch.bs (74)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1620.patch
https://github.com/whatwg/fetch/pull/1620.diff

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