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This was added due to TetherNotificationPresenter being a
MessageCenterObserver that modifies the message center. That was only
the case due to a misunderstanding (it should have used
NotificationDelegate) and is now fixed. No MessageCenterObserver instance
should modify the MC during iteration. The change queue made that
possible, but that just allowed abuse of MessageCenterObserver.

Bug: 795331
Change-Id: I25f94853e0c8b29f3929d7459ed3cd3bfd2ed780
Reviewed-on: https://chromium-review.googlesource.com/829983
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Mitsuru Oshima (In Tokyo) <oshima@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537196}