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The final release of macOS Big Sur removed CGSession, which we need to
enable curtain mode on Mac hosts.

This change adds an alternate search path for CGSession so that admins
can copy the binary there and have Mac hosts with with curtain mode.

Change-Id: Icd4e2d6c60b351c705197730341067caa41d8f09

Bug: 1169841
Change-Id: Icd4e2d6c60b351c705197730341067caa41d8f09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2645293
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Auto-Submit: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846342}