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In the unit test, focusing in status area widget was tested using
NotificationTray button and SystemTray button. As they are
consolidated in UnifiedSystemTray, the test did not work with the flag
enabled. This CL fixes the test to use IME tray button so it keeps
working with UnifiedSystemTray.

TEST=StatusAreaWidgetFocusTest.FocusOutObserver
(--enable-features=SystemTrayUnified)
BUG=847104

Change-Id: I8d8d3f274153daeb66ebc594d23b7ce4787a2cac
Reviewed-on: https://chromium-review.googlesource.com/1088331Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564923}