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The updated tooltip will include "Do not disturb is {on/off}", making it more
consistent with the other tooltip buttons.

BUG=1002471

Change-Id: I2cb41dc89aa1bf133dd77640340cc0c140a8b96a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795306Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695808}