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Initializing the system tray and message center with chrome
vox enabled causes a crash when the tray event filter references
the message center bubble before it's constructor is fully
executed.
This fix ensures this doesn't happen by separating the constructor
from the part of the code which shows the bubble.

Change-Id: I297bf5212fb82a3372081dc418c25473f22d5cd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881689
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710585}