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This reverts commit 5b7019ed.

Reason for revert: Caused a lot of animation performance regressions

Original change's description:
> Prepare CSSKeyframesMemoryReduction for finch experiment
>
> This patch adds a Chromium feature for CSSKeyframesMemoryReduction and
> enables it in field trial testing config. This is preparation for a
> Canary/Dev finch experiment.
>
> Bug: 1141814
> Change-Id: I03c1c9beca18bdf4b286704f60b6895f60835d12
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518097
> Reviewed-by: Steven Holte <holte@chromium.org>
> Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
> Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#824639}

TBR=chrishtr@chromium.org,holte@chromium.org,xiaochengh@chromium.org

Bug: 1141814, 1146436
Change-Id: I1a82fda304324739e0118718aad43c109641b97f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527726
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825623}