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Prevents showing the notification icon being invisible, or in a faded
color in certain conditions.

- Faded color after first sign-in (crbug.com/880766)
After OOBE is finished, the icon color should be updated.

- Invisible do-not-disturb icon in OOBE (crbug.com/886561)
Session status is UNKNOWN at the view creation during OOBE.

Bug: 880766,886561
Change-Id: I82d22a5d0967ab9c0fdef3b109ea3157e0244d8c
Reviewed-on: https://chromium-review.googlesource.com/1233101Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593107}