Revert of content: Single process support for native GpuMemoryBuffers.

Revert of content: Single process support for native GpuMemoryBuffers. (patchset #8 id:140001 of https://codereview.chromium.org/1120873002/)

Reason for revert:
Breaks Mac10.6 Tests: https://build.chromium.org/p/chromium.mac/builders/Mac10.6%20Tests/builds/3331

Original issue's description:
> content: Single process support for native GpuMemoryBuffers.
>
> This adds single process support for IOSurface and
> SurfaceTexture backed GpuMemoryBuffers.
>
> Also makes the SurfaceTexture code more consistent
> with IOSurface code by using a singleton instead of
> leaking a raw pointer.
>
> BUG=497559
> TEST=content_browsertests --gtest_filter=ChildThreadImplGpuMemoryBufferBrowserTests/*
>
> Committed: https://crrev.com/d5395d05e7f006ef9d1efaf8ec84030d24fb9fef
> Cr-Commit-Position: refs/heads/master@{#333625}

TBR=avi@chromium.org,dcastagna@chromium.org,reveman@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=497559
Committed: https://crrev.com/4d0ac15c70965c05e6905e5bf144cd8decf768c7
Cr-Commit-Position: refs/heads/master@{#333696}

[kjellander_chromium, 2015-06-10 07:33:21]

Created Revert of content: Single process support for native GpuMemoryBuffers.

[commit-bot: I haz the power, 2015-06-10 07:33:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1171293005/1

[commit-bot: I haz the power, 2015-06-10 07:34:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-10 07:35:25]

Patchset 1 (id:??) landed as
https://crrev.com/4d0ac15c70965c05e6905e5bf144cd8decf768c7
Cr-Commit-Position: refs/heads/master@{#333696}