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In the past, CORB allowlist could be controlled via a field trial
parameter, but that is no longer possible since r692251.  This CL
introduces a new, separate field trial parameter that can provide
similar functionality for the AllowlistAlsoAppliesToOorCors feature.

A *separate* field trial parameter is desirable because we want to
separately control 1) the old CORB allowlist that is distributed via a
field trial to old Chrome versions and 2) the new CORB+CORS allowlist
that will be distributed to new/future Chrome versions.

Bug: 920638
Change-Id: I65af7ddbc2387765b944bf1dfb05a22b1b8555c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995925
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734255}