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It'd be better to remove the notification entirely, but there are still some
users of this notification, like accessibility and power. I suspect the correct
long-term fix is to migrate these users to session state changed observers.

Bug: 784495
Change-Id: I5a60f4ff4010cb11e541415bea11245766dd6eeb
Reviewed-on: https://chromium-review.googlesource.com/964713
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550698}