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OverviewItem::Restack refers to the "dragged" window in variable names
and comments, but as of [1], the window is no longer guaranteed to be
the dragged window. Also, the whole function is hard to read.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2024148

Fixed: 1047486
Change-Id: I10c51e80ef8c9b1fce86ab60f8834fd5eaca8a06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031925
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737081}