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This reverts commit 3da0177b.

Reason for revert: Speculative revert
May have broken webgl_conformance_tests on chromeos-amd64-generic-rel:
https://ci.chromium.org/p/chromium/builders/ci/chromeos-amd64-generic-rel/45665

Original change's description:
> Add GLImageEGLPixmap for vaapi linux support.
> 
> This new image type can hook an X11 pixmap up to an egl pixmap surface,
> which lets VaapiPictureNativePixmapAngle create xlib pixmaps and bind
> them as surfaces.
> 
> With this cl, the flag --enable-accelerated-video-decode will be
> functional on a modern intel graphics linux system while using ANGLE.
> 
> Bug: 1103510
> 
> Change-Id: I9c2bce16729be1e8f007b47da5a5160074f78483
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288633
> Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
> Reviewed-by: Zhenyao Mo <zmo@chromium.org>
> Reviewed-by: Geoff Lang <geofflang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798952}

TBR=dalecurtis@chromium.org,zmo@chromium.org,geofflang@chromium.org,mcasas@chromium.org,tmathmeyer@chromium.org,andrescj@chromium.org

Change-Id: Ied00f4a03cf404f948b5670b836beeff3b6c2c4e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1103510
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359952Reviewed-by: Fergus Dall <sidereal@google.com>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#798983}