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CorbAllowlistAlsoAppliesToOorCors (aka CORS-for-content-scripts) has
been shipping to the stable channel with Chrome85 since Aug 25th (~2
weeks ago).  There have been just a handful of allowlisting requests so
far - therefore, it seems okay to declare that this change has
successfully shipped to the stable channel.

This CL transitions enabling CorbAllowlistAlsoAppliesToOorCors away from
1) fieldtrial_testing_config.json and 2) field trial config (this
includes preserving/copying the allowlisted extensions from
site_isolation/data/CorsAndCorbAllowlist.gcl to
//extensions/browser/url_loader_factory_manager.cc).

After this CL we still retain an ability to allowlist extensions:
1. Via field trial config (affecting Chrome versions prior to this CL
   - Chrome 85, Chrome 86 and a little bit of Chrome 87)
2. Via the hardcoded allowlist in
  //extensions/browser/url_loader_factory_manager.cc (although this
  ability will go away soon - after https://crrev.com/c/2388709).

This CL unblocks the following follow-up CLs:
1. Adding |max_version| to the field trial config
   (google3 - cl/330527651)
2. Starting deprecation of the allowlist
   (chromium3 - https://crrev.com/c/2388709)

Bug: 920638
Change-Id: I635eb0777dc83a7ad448f57b9de388ae071e0c9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359393
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805490}