[whatwg/fetch] Set response's CSP list once (#701)

Fixes #364.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/701

-- Commit Summary --

  * Set response's CSP list once

-- File Changes --

    M fetch.bs (10)

-- Patch Links --

https://github.com/whatwg/fetch/pull/701.patch
https://github.com/whatwg/fetch/pull/701.diff

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