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When dragging a window quickly up into the drag-to-snap split area, the
overview windows are getting relayouted and while the animations are
still going on, fling the window to homescreen. So
OverviewItem::OnItemBoundsAnimationEnded() can be called when overview
is in shutting down process, which should not happen.

Bug: 1025267, 997885
Change-Id: Ia40f3fce589554672f2134f78ac4ddd8147d0910
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918834
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715883}