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This reverts commit aa21781d.

Reason for revert: results in not visually focused browser window on ozone/linux + mouse highlights no longer work. Also, client view area doesn't show any contents. See https://crbug.com/1133195.
Original change's description:
> [ozone/wayland] Use 4x4 opaque background and stack underlay correctly
>
> Using a 4x4 sized opaque background will not regress performance in
> underlay cases because the root surface is still opaque. The background
> will be stretched out by wayland viewporter extension.
>
> This is 6/? CL for overlay forwarding using wl_subsurface.
>
> Change-Id: I59b0d4cdbfbb6727d578e286c9d19cf69a9bff32
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352523
> Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
> Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#810527}

TBR=rjkroege@chromium.org,msisov@igalia.com,fangzhoug@chromium.org

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

Bug: 1133195
Change-Id: I4d2e7d7e7b94743bf29a932bd37264ccff45b585
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438129Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#811645}