Create actor_util and move logic out of browser/ui

This is a precursor to the permissions work, we need to move this logic
out of browser/ui into the actor/ directory to be accessible to
chrome/browser/permissions. Since this permissions work needs this logic
too, this CL moves it to a centralized place to prevent duplication.

go/bd-web-permissions-dd

Bug: b:420673409
Change-Id: Ifcdc7fae49a7553a58e13872242a1f4ecec0a572
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6858702
Reviewed-by: David Pennington <dpenning@chromium.org>
Commit-Queue: Michelle Abreo <michelleabreo@google.com>
Reviewed-by: Kevin Graney <kmg@google.com>
Cr-Commit-Position: refs/heads/main@{#1504154}