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This reverts commit 9256783c.

Reason for revert: This CL may be responsible for multiple All/Overview* flaky use-of-uninitialized-value.

First failed build:
https://ci.chromium.org/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/16416?blamelist=1#blamelist-tab

Because the original CL has been landed for few days, the change in
tools/metrics/histograms/histograms.xml are not reverted due to merge warning.

Original change's description:
> Cros: Add metrics for transitions in the hotseat
>
> Report animation smoothness for the transition into the hotseat in the
> HomeLauncher.
>
> Bug: 1022178, 1022177
> Change-Id: I5dc5e76688aa5a88bcabb5d688b419d819932867
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917941
> Commit-Queue: Ana Salazar <anasalazar@chromium.org>
> Reviewed-by: Alex Newcomer <newcomer@chromium.org>
> Reviewed-by: Manu Cornet <manucornet@chromium.org>
> Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#718266}

TBR=nikunjb@chromium.org,newcomer@chromium.org,manucornet@chromium.org,anasalazar@chromium.org

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

Bug: 1022178, 1022177, 1028255
Change-Id: If460f00f10fb8f8df2a9f7d3d41abfdd91f0ad0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933739
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718782}