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This reverts commit 43be36f0.

Reason for revert: Multiple CTS failures

Bug: b:175379280
Bug: b:175514308
Bug: b:175829322

Original change's description:
> exo: Allow Pointer Capture when window is active
>
> Pointer Capture was being rejected by chrome when an app came into
> focus using keyboard shortcuts (Alt-Tab), but was working as intended
> when an app came into focus using the mouse or touchscreen. It was being
> rejected because the capture_surface was the sub-surface of the current
> focused surface.
>
> Since the client is responsible for providing the capture surface
> through the wayland pointer constraints protocol, it is possible
> for the client to request capture on a sub-surface of the current
> active surface. Requesting capture on a sub-surface is a valid request
> for capture. Rather than ensuring that the capture surface is focused
> (used for directing key events), we verify that the active window
> contains the window of the capture surface in its hierarchy before we
> allow the pointer to be constrained to the surface.
>
> This also allows the client to change the cursor while the client has
> capture, even when the mouse cursor is not currently over a client
> window.
>
> BUG=b:153973515
> TEST=manual: request pointer capture, leave app, return to app using
> Alt+Tab, verify app has pointer capture.
> TEST=exo_unittests
>
> Change-Id: I56e76469f35ea43100748ebe27966464e32805fc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559255
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
> Commit-Queue: Prabir Pradhan <prabirmsp@chromium.org>
> Auto-Submit: Prabir Pradhan <prabirmsp@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#832613}

TBR=oshima@chromium.org,tetsui@chromium.org,prabirmsp@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

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

Bug: b:153973515
Change-Id: I582f775f37c34149fb7f0c2a6b9162b5e72cbf78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596065
Commit-Queue: Prabir Pradhan <prabirmsp@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Auto-Submit: Prabir Pradhan <prabirmsp@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837908}