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This reverts commit 1980f0cb.

Reason for revert: Kernel uprev for SKL is not complete in M89.

Original change's description:
> Revert "media/gpu/test/VFValidator: Workaround the buffer synchronization problem on intel 3.18"
>
> This reverts commit 276dd2ba.
>
> Reason for revert: The root cause of the synchronization is fixed.
> Removes this workaround.
>
> Original change's description:
> > media/gpu/test/VFValidator: Workaround the buffer synchronization problem on intel 3.18
> >
> > There is a synchronization problem on the mapped buffer on intel
> > skylake devices. This is due to some missing 9165 patches in kernel
> > 3.18, and thus will be fixed if the kernel is upreved to 4.4 or
> > newer. This bug causes a decoded content validation failure in
> > video_decode_accelerator_tests.
> > This is a workaround to this bug; usleep() is added after the
> > buffer is mapped and before the frame validation if the kernel
> > version is 3.18 and the processor is Skylake.
> >
> > Bug: b:149808895
> > Test: video_decode_accelerator_tests on sentry
> > Change-Id: Ib77ebe0b83834e4d91bc994cbe6912348862e021
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371724
> > Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
> > Reviewed-by: Miguel Casas <mcasas@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#801614}
>
> TBR=mcasas@chromium.org,hiroh@chromium.org,andrescj@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: b:149808895
> Change-Id: Id0f1bdcc486effef2c6d3fd64275d71051020028
> Test: None
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631645
> Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
> Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#843919}

TBR=mcasas@chromium.org,hiroh@chromium.org,andrescj@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

# Not skipping CQ checks because this is a reland.

Bug: b:149808895
Change-Id: I1f592a49c0276154101c59044c63c652c173e6af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631808Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843956}