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CfM devices default to static time zone. To expand this into user sessions,
new users created on Chrome OS devices will default to static time zone.

Otherwise static time zone was limited to signin screen only, which is not
what was usually needed.

Bug: 1018720
Change-Id: I977119e41238f29434b3a742b950ff7edb87ff03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030001
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737144}