Remove calls to deprecated MessageLoop methods in ppapi.

Remove calls to deprecated MessageLoop methods in ppapi.

This CL (hopefully) removes all calls to these methods in ppapi:
- MessageLoop::PostTask
- MessageLoop::PostDelayedTask
- MessageLoop::DeleteSoon
- MessageLoop::ReleaseSoon
- MessageLoop::Run
- MessageLoop::RunUntilIdle

BUG=616447
R=bbudge@chromium.org

Committed: https://crrev.com/a5aacdb8469393764fcf5ae296e1176ac6f25650
Cr-Commit-Position: refs/heads/master@{#416805}

[fdoray, 2016-09-06 20:29:01]

The CQ bit was checked by fdoray@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-06 20:29:32]

Dry run: 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, 2016-09-06 21:29:35]

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

[commit-bot: I haz the power, 2016-09-06 21:29:36]

Dry run: This issue passed the CQ dry run.

[fdoray, 2016-09-06 21:56:55]

PTAL

[bbudge, 2016-09-07 00:44:16]

lgtm

[fdoray, 2016-09-07 00:49:14]

The CQ bit was checked by fdoray@chromium.org

[commit-bot: I haz the power, 2016-09-07 00:49:27]

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, 2016-09-07 00:53:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-07 00:55:54]

Description was changed from

==========
Remove calls to deprecated MessageLoop methods in ppapi.

This CL (hopefully) removes all calls to these methods in ppapi:
- MessageLoop::PostTask
- MessageLoop::PostDelayedTask
- MessageLoop::DeleteSoon
- MessageLoop::ReleaseSoon
- MessageLoop::Run
- MessageLoop::RunUntilIdle

BUG=616447
R=bbudge@chromium.org
==========

to

==========
Remove calls to deprecated MessageLoop methods in ppapi.

This CL (hopefully) removes all calls to these methods in ppapi:
- MessageLoop::PostTask
- MessageLoop::PostDelayedTask
- MessageLoop::DeleteSoon
- MessageLoop::ReleaseSoon
- MessageLoop::Run
- MessageLoop::RunUntilIdle

BUG=616447
R=bbudge@chromium.org

Committed: https://crrev.com/a5aacdb8469393764fcf5ae296e1176ac6f25650
Cr-Commit-Position: refs/heads/master@{#416805}
==========

[commit-bot: I haz the power, 2016-09-07 00:55:55]

Patchset 1 (id:??) landed as
https://crrev.com/a5aacdb8469393764fcf5ae296e1176ac6f25650
Cr-Commit-Position: refs/heads/master@{#416805}