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This reverts commit 6809a4d6.

Reason for revert: This is breaking many Mac builds (see linked issue).

Original change's description:
> Use scanout overlays for pepper2d when possible.
> 
> If GL image textures are supported, and we can find the image texture
> target for the desired format, then use TexStorage2DImageCHROMIUM to
> allocate the texture so that it may be used for scanout.
> 
> R=​piman@chromium.org
> 
> Bug: 786140
> Change-Id: I36875f82796614f4d5c7290f27bd0bacfce510fb
> Reviewed-on: https://chromium-review.googlesource.com/779883
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Commit-Queue: danakj <danakj@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#518269}

TBR=danakj@chromium.org,piman@chromium.org

Change-Id: I747d76984c0641a01a44e62595432d287baf7405
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 786140,787548
Reviewed-on: https://chromium-review.googlesource.com/783491Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518449}