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- Because PowerMonitor uses ObserverListThreadSafe, the observers are
  notified on the sequence from which they were registered.

Change-Id: Iea01ec415fca7b9b327a9b1d92ed77008e0cd77c
Reviewed-on: https://chromium-review.googlesource.com/1089584Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Rintaro Kuroiwa <rkuroiwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565122}