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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/+/2631645Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843919}