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This reverts commit f3947c5a.

Reason for revert:

broke generate_buildfiles step on chromeos-amd64-generic-dbg by
creating a dependency cycle

Original change's description:
> gpu: Add a new vaapi shared image representation
>
> This CL creates a new shared image representation as a VASurface. This
> representation will be used in an Ozone context to represent a video
> frame that was produced by the video acceleration api.
>
> This representation will allow us to pass a NativePixmap to the VA-API
> for the purposes of hardware accelerated video decoding.
>
> We currently follow a VideoFrame centered design where the decoded
> buffer is written onto from the hardware decoder as a VASurfaceID. The
> decoded graphics buffer is wrapped in a VideoFrame, and passed to the
> graphics pipeline as a Mailbox. This change eliminates the need to
> convert buffers into the various required forms, and instead centralize
> the lifetime as a single entity.
>
> BUG=1058103
> TEST=None
>
> Change-Id: I482f3aa6d29a7093e8016ab4e74762e61c600865
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083662
> Reviewed-by: Miguel Casas <mcasas@chromium.org>
> Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
> Reviewed-by: Khushal <khushalsagar@chromium.org>
> Commit-Queue: Paulo Warren <pwarren@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#754533}

TBR=mcasas@chromium.org,khushalsagar@chromium.org,andrescj@chromium.org,hob@chromium.org,pwarren@chromium.org

Change-Id: Ib52ecc8438feed6e570f10c96917104367df5d40
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1058103,1066160
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127328
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754574}