Call ChildThread::Shutdown in PpapiThread::Shutdown.

Call ChildThread::Shutdown in PpapiThread::Shutdown.

BUG=None

Committed: https://crrev.com/4ff79fa7b6477808bdff2bb7589da312269d8ec2
Cr-Commit-Position: refs/heads/master@{#293260}

[tzik, 2014-09-03 04:02:20]

tzik@chromium.org changed reviewers:
+ piman@chromium.org

[tzik, 2014-09-03 04:02:20]

PTL.

Other subclasses of ChildThread seem to call ChildThread::Shutdown, which is
overridden by the subclass's one. But PpapiThread::Shutdown doesn't.

Can I add it if it's not intentional?

[piman, 2014-09-03 20:14:49]

lgtm

[tzik, 2014-09-03 21:10:49]

The CQ bit was checked by tzik@chromium.org

[commit-bot: I haz the power, 2014-09-03 21:21:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tzik@chromium.org/536783003/1

[commit-bot: I haz the power, 2014-09-04 03:12:46]

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

[commit-bot: I haz the power, 2014-09-04 03:12:48]

Try jobs failed on following builders:
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[tzik, 2014-09-04 03:51:29]

The CQ bit was checked by tzik@chromium.org

[commit-bot: I haz the power, 2014-09-04 03:53:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tzik@chromium.org/536783003/1

[commit-bot: I haz the power, 2014-09-04 04:59:28]

Committed patchset #1 (id:1) as 2cee1f14bef85a8aeb25c7b75f0b71b203dc8252

[commit-bot: I haz the power, 2014-09-10 03:29:50]

Patchset 1 (id:??) landed as
https://crrev.com/4ff79fa7b6477808bdff2bb7589da312269d8ec2
Cr-Commit-Position: refs/heads/master@{#293260}