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This reverts commit 209edd56.

Reason for revert: The test SplitViewWindowSelectorTest.DragToClose
is flaky (mostly failing) on builder Linux Chromium OS ASan LSan Tests
e.g.
https://ci.chromium.org/buildbot/chromium.memory/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/27234

Original change's description:
> overview: Initial patch for overview swipe to close.
>
> Adds ability to drag the overview item up or fling the item up to close
> the window. A later cl will add the fling animation. The feature is
> hidden behind a newly added flag.
>
> Test: added test coverage
> Bug: 828646
> Change-Id: I8e66fb3ed2a642deb6a833f30e9b7674d56b0fee
> Reviewed-on: https://chromium-review.googlesource.com/1014490
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#554651}

TBR=oshima@chromium.org,xdai@chromium.org,sammiequon@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 828646, 838061
Change-Id: I3eaedf6f764120131b4da729c7425056ef2bd018
Reviewed-on: https://chromium-review.googlesource.com/1033673
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554710}