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This reverts commit d680737d.

Reason for revert: Causes a different crash in return for fixing one.

Original change's description:
> Fix message center crash
>
> Modify check for message center gaining activation to not
> dereference the message center widget. There's a crash
> caused by focus switching between the message center
> and quick setting bubbles before the message center bubble's
> constructor has exited.
>
> Change-Id: Ia15acb47dc3806466a2f40a73e843333655e7953
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860692
> Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
> Reviewed-by: Tim Song <tengs@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#705749}

TBR=tengs@chromium.org,amehfooz@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ie38a91a9c3ef177425b461ec6b42822d0c0c5bdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865657Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706680}