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In UnifiedSystemTray, a11y feature pod button can be shown in collapsed
state. In that case, when the button is clicked, the a11y detailed view
was shown without expanding the system tray. See the screenshot.

Screenshot of the bug: http://screen/wWb2MxGwxMM

TEST=manual
BUG=856035

Change-Id: Ib345450a07f258156ac82a4f62584c058ec9b35d
Reviewed-on: https://chromium-review.googlesource.com/1116627Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571036}