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This change fixes a number of crashes caused by the message center
widget being destroyed without it's animations being cleaned up
properly.

Change-Id: If70b46d530867721785cd208db937207c6dcc865
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877256
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709266}