Revert of Fix EXT_draw_buffers detection on some GL ES 3 contexts

Revert of Fix EXT_draw_buffers detection on some GL ES 3 contexts (patchset #10 id:180001 of https://codereview.chromium.org/2678483003/ )

Reason for revert:
Failures on waterfall almost certainly due to this CL

Original issue's description:
> Fix EXT_draw_buffers detection on some GL ES 3 contexts
> 
> This also disables ES2 EXT_draw_buffers emulation on top of ES3+NV_draw_buffers as it's not needed anymore - EXT_draw_buffers can now be emulated on vanilla ES3.
> 
> This is important on some native GL ES 3 contexts (e.g. Qualcomm on Google Pixel).
> 
> BUG=688632
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> 
> Review-Url: https://codereview.chromium.org/2678483003
> Cr-Commit-Position: refs/heads/master@{#450804}
> Committed: https://chromium.googlesource.com/chromium/src/+/252e09263e39d4e06b2a9dc094ea30ca140e0a4d

TBR=zmo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=688632
Review-Url: https://codereview.chromium.org/2696333002
Cr-Commit-Position: refs/heads/master@{#450846}
Committed: https://chromium.googlesource.com/chromium/src/+/81ee0eb7c58ddf35cce08886ab5a6d4fc4303b71

[Kai Ninomiya, 2017-02-16 00:48:11]

The CQ bit was checked by kainino@chromium.org

[Kai Ninomiya, 2017-02-16 00:48:12]

Created Revert of Fix EXT_draw_buffers detection on some GL ES 3 contexts

[commit-bot: I haz the power, 2017-02-16 00:49:22]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-16 00:50:14]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487206091457210, "parent_rev":
"917adcfaa04e622273c5a64694fa578e03ac58ff", "commit_rev":
"81ee0eb7c58ddf35cce08886ab5a6d4fc4303b71"}

[commit-bot: I haz the power, 2017-02-16 00:50:59]

Description was changed from

==========
Revert of Fix EXT_draw_buffers detection on some GL ES 3 contexts (patchset #10
id:180001 of https://codereview.chromium.org/2678483003/ )

Reason for revert:
Failures on waterfall almost certainly due to this CL

Original issue's description:
> Fix EXT_draw_buffers detection on some GL ES 3 contexts
> 
> This also disables ES2 EXT_draw_buffers emulation on top of
ES3+NV_draw_buffers as it's not needed anymore - EXT_draw_buffers can now be
emulated on vanilla ES3.
> 
> This is important on some native GL ES 3 contexts (e.g. Qualcomm on Google
Pixel).
> 
> BUG=688632
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> 
> Review-Url: https://codereview.chromium.org/2678483003
> Cr-Commit-Position: refs/heads/master@{#450804}
> Committed:
https://chromium.googlesource.com/chromium/src/+/252e09263e39d4e06b2a9dc094ea...

TBR=zmo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=688632
==========

to

==========
Revert of Fix EXT_draw_buffers detection on some GL ES 3 contexts (patchset #10
id:180001 of https://codereview.chromium.org/2678483003/ )

Reason for revert:
Failures on waterfall almost certainly due to this CL

Original issue's description:
> Fix EXT_draw_buffers detection on some GL ES 3 contexts
> 
> This also disables ES2 EXT_draw_buffers emulation on top of
ES3+NV_draw_buffers as it's not needed anymore - EXT_draw_buffers can now be
emulated on vanilla ES3.
> 
> This is important on some native GL ES 3 contexts (e.g. Qualcomm on Google
Pixel).
> 
> BUG=688632
>
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> 
> Review-Url: https://codereview.chromium.org/2678483003
> Cr-Commit-Position: refs/heads/master@{#450804}
> Committed:
https://chromium.googlesource.com/chromium/src/+/252e09263e39d4e06b2a9dc094ea...

TBR=zmo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=688632

Review-Url: https://codereview.chromium.org/2696333002
Cr-Commit-Position: refs/heads/master@{#450846}
Committed:
https://chromium.googlesource.com/chromium/src/+/81ee0eb7c58ddf35cce08886ab5a...
==========

[commit-bot: I haz the power, 2017-02-16 00:51:00]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/81ee0eb7c58ddf35cce08886ab5a...