Revert of Use the desktop GL core profile on Linux when ES3 support is requested.

Revert of Use the desktop GL core profile on Linux when ES3 support is requested. (patchset #3 id:40001 of https://codereview.chromium.org/1052153002/)

Reason for revert:
This causes Chrome rendering to break on some Chrome OS devices, see crbug.com/473891 for details

Original issue's description:
> Use the desktop GL core profile on Linux when ES3 support is requested.
>
> Request an OpenGL 4.2 context (the minimum version Chromium's WebGL
> 2.0 prototype currently requires) on Linux when
> --enable-unsafe-es3-apis is specified on the command line.
>
> Clean up the shader translator's selection of the GLSL output format.
>
> BUG=471960
>
> Committed: https://crrev.com/0b17446f9591af9377d18c9ccfe50471651d6bc7
> Cr-Commit-Position: refs/heads/master@{#323658}

TBR=piman@chromium.org,kbr@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=471960
Committed: https://crrev.com/1856f5d5e47d72742a12153f4e85ee0db00c11a0
Cr-Commit-Position: refs/heads/master@{#323866}

[marcheu, 2015-04-04 01:41:18]

Created Revert of Use the desktop GL core profile on Linux when ES3 support is
requested.

[commit-bot: I haz the power, 2015-04-04 01:41:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1054883004/1

[commit-bot: I haz the power, 2015-04-04 01:43:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-04 01:43:56]

Patchset 1 (id:??) landed as
https://crrev.com/1856f5d5e47d72742a12153f4e85ee0db00c11a0
Cr-Commit-Position: refs/heads/master@{#323866}