GitLab

With crrev.com/c/1830084 we removed the only workaround that was using
disable_non_empty_post_sub_buffers_for_onscreen_surfaces.

This CL cleans up related code.

Bug: 457511
Change-Id: Id2ea16b9ce91e5b59401e253519057c7f45796a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700562
Auto-Submit: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742990}