[whatwg/fetch] Remove the CORS flag (#960)

As far as I can tell we use "response tainting" for the same thing.

This also fixes an issue whereby we checked origin tainting rather than response tainting in main fetch which results in a minor bug when it comes to opaquing A -> B -> A chains.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/960

-- Commit Summary --

  * Remove the CORS flag

-- File Changes --

    M fetch.bs (114)

-- Patch Links --

https://github.com/whatwg/fetch/pull/960.patch
https://github.com/whatwg/fetch/pull/960.diff

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