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This CL adds destructors to the MediaNotificationController and
MediaNotificationContainer interfaces.

Bug: 1002746
Change-Id: Ic5d2f7725168bc504827565ac2fbfc9eb8351ee3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798499
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695729}