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The message center redesign kUnifiedMessageCenterRefactor feature
is disabled by default, and is only enabled on the devices that
has hotseat feature enabled (i.e., on Krane and on Dogfood devices).

Bug: 976952, 958020
Change-Id: I172f310831a0ef64dfecccc210850464b2a5c80b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1951283
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721653}