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Without being a system notifier, 
MultiUserNotificationBlockerChromeOS::ShouldShowNotification()
returns false, preventing Tether notifications from
displaying. It's appropriate to consider Tether a system 
notifier given that it is baked into the system tray and 
Settings.

Bug: 747639, 672263
Change-Id: I0f0d9a4ce3da7c62b148af979c611eaca6682053
Reviewed-on: https://chromium-review.googlesource.com/596833
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491416}