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It fixes FirstRunUIBrowserTest when UnifiedSystemTray is enabled.

The test is regressed by interactive_ui_tests fix
https://crrev.com/c/1096718. We only have to set initial focus when
system tray bubble is activated.

This is a flag flip blocker of
chrome://flags/#enable-system-tray-unified.

TEST=FirstRunUIBrowserTest.EscapeCancelsTutorial
BUG=847104

Change-Id: Iccb8ea92724fffc787a649e1a4fdac36507f3b71
Reviewed-on: https://chromium-review.googlesource.com/1098419
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566718}