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Deprecate legacy power management policies

Deprecate the following policies, because the redundancy with PowerManagementIdleSettings and ScreenLockDelays is distracting and misleading.
- ScreenDimDelayAC
- ScreenDimDelayBattery
- ScreenOffDelayAC
- ScreenOffDelayBattery
- ScreenLockDelayAC
- ScreenLockDelayBattery
- IdleWarningDelayAC
- IdleWarningDelayBattery
- IdleDelayAC
- IdleDelayBattery
- IdleActionAC
- IdleActionBattery
- IdleAction

Bug: 346229
Change-Id: Ib50ad8c0c6b723c15b684b8af4b70758210922eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839957Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Aya Elsayed <ayaelattar@google.com>
Cr-Commit-Position: refs/heads/master@{#707410}