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Previously, I have added SystemTrayView class which was owned by SystemTray class (crrev.com/727379). But the views in the tray are assumed to be destroyed with the parent view and the bubble, so that caused some issues.
This patch changes that and makes SystemTrayView owned by the view hierarchy. Then the issues are solved.

This patch also updates the newly-added code in NetworkStateListDetaiedView because the code didn't assume that lifetime of views.

Bug: 790716, 789833
Change-Id: I62eca328780cabb7c5d68967cc1ddee7a1e23b9a
Reviewed-on: https://chromium-review.googlesource.com/813153
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523701}