Revert of Support using OpenGL ES context on desktop

Revert of Support using OpenGL ES context on desktop (https://codereview.chromium.org/319043005/)

Reason for revert:
Breaks unit tests on ANGLE bot.

Original issue's description:
> Support using OpenGL ES context on desktop
> 
> Support using OpenGL ES context on desktop for unix and Android platforms. This
> is mainly useful in development.
> 
> Add --gpuAPI flag to gm, dm, bench, bench_pictures and render_pictures. The
> possible parameters for the flag are "gl" and "gles".
> 
> Committed: https://skia.googlesource.com/skia/+/80549fcdd50269d7e069d6db02b395fca128056c

[bsalomon, 2014-06-30 15:36:12]

Created Revert of Support using OpenGL ES context on desktop

[commit-bot: I haz the power, 2014-06-30 15:36:29]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/bsalomon@google.com/341433007/1

[commit-bot: I haz the power, 2014-06-30 15:36:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-30 15:36:30]

No LGTM from a valid reviewer yet. Please ask for an LGTM from a
full Skia committer from
https://skia.googlesource.com/skia/+/master/CQ_COMMITTERS

[mtklein, 2014-06-30 15:36:57]

lgtm

[bsalomon, 2014-06-30 15:55:36]

The CQ bit was unchecked by bsalomon@google.com

[bsalomon, 2014-06-30 15:55:55]

I now have a fix, killing this revert.