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This CL fixes ShowSystemTrayOnPrimaryLoginScreen when UnifiedSystemTray
is enabled. A system tray should not SetVisible(true) before
UpdateAfterLoginStatusChange is called.

TEST=LoginScreenControllerNoSessionTest.ShowSystemTrayOnPrimaryLoginScreen
(--enable-features=SystemTrayUnified)
BUG=847104

Change-Id: I2ca02dd55def1385e769f00604cd42281413d8b7
Reviewed-on: https://chromium-review.googlesource.com/1088266
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564924}