GitLab

This CL removes the allowlist that has been hardcoded into Chromium
source code.  The deprecation has been announced on chromium-extension@
discussion list, and in the enterprise release notes.

The CL introduces a new feature that will be used by the
field-trial-param-based mechanism for distributing the allowlist.  This
can be used to retain extensions on the allowlist if for some reason
they didn't migrate to the new security model in Chrome 87.

Bug: 1124077
Change-Id: I96c1df1f5b08e177b74f8168b7bd4172c045b391
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388709Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807240}