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When you drag an ARC window from one overview grid and drop into another
overview grid, it shall neither cause a crash nor cause overview to end.

Test: manual
Bug: 961170
Change-Id: Iac895e4f896cf652dc2d522f3f1b8a4c1765416b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088507Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747481}