Revert of Roll WebGL conformance tests.

Revert of Roll WebGL conformance tests. (patchset #4 id:250001 of https://codereview.chromium.org/641173002/)

Reason for revert:
might cause a bunch of texture related tests to timeout

conformance_textures_texture_formats_test
conformance_textures_texture_hd_dpi
conformance_textures_texture_mips
conformance_textures_texture_npot
conformance_textures_texture_npot_video
conformance_textures_texture_size
conformance_textures_texture_size_cube_maps
conformance_textures_texture_size_limit
conformance_textures_texture_sub_image_cube_maps
conformance_textures_texture_transparent_pixels_initialized
conformance_textures_texture_upload_cube_maps

Original issue's description:
> Roll WebGL conformance tests.
>
> BUG=401311, 421705
> TEST=gpu bots
> NOTRY=true
> R=kbr@chromium.org
>
> Committed: https://crrev.com/84d03b89afa3baade276d0f7ac7892ab77ed8d21
> Cr-Commit-Position: refs/heads/master@{#299134}

TBR=kbr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=401311, 421705
Committed: https://crrev.com/efc8626390b6e19a7882725b7389f775f73bd023
Cr-Commit-Position: refs/heads/master@{#299166}

[Zhenyao Mo, 2014-10-10 19:49:04]

Created Revert of Roll WebGL conformance tests.

[commit-bot: I haz the power, 2014-10-10 19:50:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/648833003/1

[commit-bot: I haz the power, 2014-10-10 19:51:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-10 19:51:38]

Patchset 1 (id:??) landed as
https://crrev.com/efc8626390b6e19a7882725b7389f775f73bd023
Cr-Commit-Position: refs/heads/master@{#299166}