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This reverts commit 0dce55ff.

Reason for revert: This has caused a crash in many CrOS tests: https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/20119

Original change's description:
> Chrome OS: Use layer animation browser window frame activation animation.
> 
> This is a revised version of original attempt crrev.comc/c/2166804.
> Instead of creating a new layers, this clone and animate the window's layer,
> but makes sure that the animating layer is at the bottom of other layers
> within the window.
> 
> * It adds a invisible view with a layer
>   at the bottom of the non_client_view (no frame w/o this, so we can exclude such case).
> * Adds the animating layer as a child of this view, with
>   "SetMasksToBounds(false)" so that it will not be clipped during animation.
> * Once animation is done, this animating, old layer will be removed.
> 
> Bug: 1073685
> Test: covered by unittests.
> Change-Id: Ib9ae60694fb461dda354fea4fd52e4e01186a6a7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335811
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#800827}

TBR=sky@chromium.org,oshima@chromium.org

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

Bug: 1073685
Change-Id: I093849df58f25a46a021f923daab1ab1faa1efee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371383Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Commit-Queue: Alice Boxhall <aboxhall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800896}