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This reverts commit 3a6b8b82.

Reason for revert: Speculative revert for DesksGestureHandlerTest.HorizontalScrolls and ReverseGestureHandlerTest.SwitchDesk failure on linux-chromeos-dbg
crbug.com/1150701

Original change's description:
> desks: Enable enhanced desk animations by default.
>
> Enabling also exposed a DCHECK where the throughput tracker was being
> Stopped when it was not started. This was previously missed, because
> manual testing was all done on a device, where DCHECKs were disabled.
>
> Bug: 1148923
> Test: none
> Change-Id: I9c9236f04da072e0a63eb118db0969716a71ffdd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537131
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#828916}

TBR=afakhry@chromium.org,sammiequon@chromium.org

Change-Id: I2db6cb1342dc0d20d0374d5da96dc9988dbfd5a8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1148923
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547855Reviewed-by: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829090}