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This reverts commit 8b7817c7.

Reason for revert: assertion failures in the default configuration of webgl_conformance_tests per crbug.com/1132730 .

Original change's description:
> Enable SharedImages for VTVideoDecodeAccelerator
>
> Add a method to media::VideoDecodeAccelerator to indicate whether
> SharedImage-backed picture buffers are supported. Make this return
> true only for the VTVideoDecodeAccelerator.
>
> Add a parameter to media::PictureBufferManager::CreatePictureBuffers
> to indicate if SharedImage-backed PictureBuffers are desired.
>
> Hook the two of these together in the ProvidePictureBuffersAsync
> method of media::VdaVideoDecoder.
>
> Video playback fails with the Metal-based command decoder, because
> it binds IOSurfaces as TEXTURE_2D, not TEXTURE_RECTANGLE. Plumb
> through a flag to specify if TEXTURE_RECTANGLE support is present.
>
> Bug: 1108909
> Change-Id: I1e42aa38e122714517724cee87eb51987645e410
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427545
> Commit-Queue: ccameron <ccameron@chromium.org>
> Reviewed-by: ccameron <ccameron@chromium.org>
> Reviewed-by: Dan Sanders <sandersd@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#811077}

TBR=ccameron@chromium.org,sandersd@chromium.org,jonahr@google.com

Change-Id: I21aa3be7737dc3a2d3d9d0d0cceb4fea2b1fca54
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1108909, 1132730
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435779Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811306}