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This previously inherited settings from the base profile even if they
were configured not to, which e.g. made client hints in incognito be
improperly influenced by the normal profile state, as noticed
by Aaron Tagliaboschi (and originally started to fix in a different
way in https://chromium-review.googlesource.com/c/chromium/src/+/2034051)

This also appeared to cause some weirdness with important site computation (bug 993021) and with some device permissions.

Bug: 1052406, 993021
Change-Id: Ieeaaf0d508161568455ed077be820fd03831afdc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2047446
Commit-Queue: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745488}