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According to Stability.iOS.UTE.MobileSessionAppState, a large number
of Unexplained Termination Events happen in background. There is an
assumption that "clean exit beacon" does not get written because
prefs file is protected. This CL allows removing protection in the
experiment. The experiment will be run on Canary and Dev to test
the assumption. There is no intention to roll this out to Beta or Stable.

If experiment will confirm the assumption, then clean exit beacon
file will be decoupled from prefs to remove the protection.

Bug: None
Change-Id: If816c4b3ed28ba5b2649e63526d5cfea93f839c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506175Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824585}