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Nothing inherits from the Mac MenuController, except its own tests.
It also sends out some notifications that were once used by a test,
which was recently deleted.

Bug: 832676
Change-Id: Ie95206a3a17461c41683422d61f5a18e4ae5c95a
Reviewed-on: https://chromium-review.googlesource.com/1250466Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595718}