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When Alt+Shift+N is used to open the message center, the first
notification will be focused with this change.
This fix is only available when the "Enable Message Center Redesign"
flag is enabled.

Bug: 1009485
Change-Id: I3509725aa76ad10d2a711c7cd923af4adc6ba31c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859647Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705748}