Revert of Pepper: Add a nullptr check.

Revert of Pepper: Add a nullptr check. (patchset #3 id:40001 of https://codereview.chromium.org/1951263003/ )

Reason for revert:
Breaks WebGL on CrOS, crbug.com/610411.

Original issue's description:
> Pepper: Associate TextureMailboxes with the Graphics3D they were obtained from.
>
> This allows the TextureMailbox to be returned to the appropriate Graphics3D,
> which implicitly deals with trying to return a TextureMailbox to a null
> Graphics3D.
>
> BUG=602484
>
> Committed: https://crrev.com/5fcc55335e3b5ba36a0de1a2e7a0976c859f6fff
> Cr-Commit-Position: refs/heads/master@{#391934}

TBR=piman@chromium.org,erikchen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=602484
Committed: https://crrev.com/e8e99f4cc7787cd52aad8f514a03db5aeadf1feb
Cr-Commit-Position: refs/heads/master@{#392542}

[ilja, 2016-05-10 02:16:44]

Created Revert of Pepper: Add a nullptr check.

[commit-bot: I haz the power, 2016-05-10 02:17:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1963633003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1963633003/1

[commit-bot: I haz the power, 2016-05-10 02:17:12]

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

[commit-bot: I haz the power, 2016-05-10 02:17:12]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[hshi1, 2016-05-10 02:20:49]

hshi@chromium.org changed reviewers:
+ hshi@chromium.org

[hshi1, 2016-05-10 02:20:49]

lgtm

[ilja, 2016-05-10 03:27:45]

The CQ bit was checked by ihf@chromium.org

[commit-bot: I haz the power, 2016-05-10 03:27:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1963633003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1963633003/1

[commit-bot: I haz the power, 2016-05-10 04:15:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-10 04:17:21]

Description was changed from

==========
Revert of Pepper: Add a nullptr check. (patchset #3 id:40001 of
https://codereview.chromium.org/1951263003/ )

Reason for revert:
Breaks WebGL on CrOS, crbug.com/610411.

Original issue's description:
> Pepper: Associate TextureMailboxes with the Graphics3D they were obtained
from.
> 
> This allows the TextureMailbox to be returned to the appropriate Graphics3D,
> which implicitly deals with trying to return a TextureMailbox to a null
> Graphics3D.
> 
> BUG=602484
> 
> Committed: https://crrev.com/5fcc55335e3b5ba36a0de1a2e7a0976c859f6fff
> Cr-Commit-Position: refs/heads/master@{#391934}

TBR=piman@chromium.org,erikchen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=602484
==========

to

==========
Revert of Pepper: Add a nullptr check. (patchset #3 id:40001 of
https://codereview.chromium.org/1951263003/ )

Reason for revert:
Breaks WebGL on CrOS, crbug.com/610411.

Original issue's description:
> Pepper: Associate TextureMailboxes with the Graphics3D they were obtained
from.
>
> This allows the TextureMailbox to be returned to the appropriate Graphics3D,
> which implicitly deals with trying to return a TextureMailbox to a null
> Graphics3D.
>
> BUG=602484
>
> Committed: https://crrev.com/5fcc55335e3b5ba36a0de1a2e7a0976c859f6fff
> Cr-Commit-Position: refs/heads/master@{#391934}

TBR=piman@chromium.org,erikchen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=602484

Committed: https://crrev.com/e8e99f4cc7787cd52aad8f514a03db5aeadf1feb
Cr-Commit-Position: refs/heads/master@{#392542}
==========

[commit-bot: I haz the power, 2016-05-10 04:17:22]

Patchset 1 (id:??) landed as
https://crrev.com/e8e99f4cc7787cd52aad8f514a03db5aeadf1feb
Cr-Commit-Position: refs/heads/master@{#392542}