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This fixes the issue when ARC++ window goes in/out full-screen or
minimized/restored. In this case a window is removed deep inside
the top ARC++ window and this triggers the wrong logout time
activation.
On removing l
This CL checks removing window that belongs to tracked top windows and
ignored hierarchy change events for other child windows.

Test: Manually + unit test
Bug: b/79169326
Change-Id: I825dd9d16d32ce305d43003fb2e77194cfc5ca7c
Reviewed-on: https://chromium-review.googlesource.com/1045827
Commit-Queue: Yury Khmel <khmel@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559155}