[whatwg/fetch] Add policy container to request (#1231)

This change adds a policy container to the request. The idea is to snapshot the policies when the request is created and have them available for the whole lifetime of the fetch algorithm. Together with a change to CSP, this will solve https://github.com/whatwg/fetch/issues/832.

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

  https://github.com/whatwg/fetch/pull/1231

-- Commit Summary --

  * Add policy container to request

-- File Changes --

    M fetch.bs (22)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1231.patch
https://github.com/whatwg/fetch/pull/1231.diff

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