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This change makes ShelfController and AppListControllerImpl a
MessageCenterObserver. This allows them to hide/show the app badges from
being shown whenever quiet mode is enabled/disabled.

Bug: 1130940
Change-Id: Ia26890b266b1d8ba26529afddf8347f21729bfb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436859Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811877}