Replace MessageLoopProxy with SingleThreadTaskRunner for the rest of media/.

Replace MessageLoopProxy with SingleThreadTaskRunner for the rest of media/.

BUG=315922
R=dalecurtis@chromium.org
TBR=jam

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=243390

[scherkus (not reviewing), 2013-11-08 03:40:07]

you get this one because changing AudioManager::GetMessageLoop() required
changing the world

I did a scan and tried to call outdated documentation / variable names (e.g.,
foo_loop_ -> foo_task_runner_) but could use the extra pair of eyes.

I also renamed stuff like ScopedLoopObserver -> ScopedTaskRunnerObserver ... but
anyway feel free to suggest naming improvements etc.

[DaleCurtis, 2013-11-08 19:32:14]

lgtm, though my eyes crossed somewhere around line 9001.

https://codereview.chromium.org/66183002/diff/30001/media/audio/scoped_task_r...
File media/audio/scoped_task_runner_observer.h (right):

https://codereview.chromium.org/66183002/diff/30001/media/audio/scoped_task_r...
media/audio/scoped_task_runner_observer.h:24: class ScopedTaskRunnerObserver
Didn't know we had this, probably a few places that could be switched over to
use it.

https://codereview.chromium.org/66183002/diff/30001/media/audio/scoped_task_r...
media/audio/scoped_task_runner_observer.h:28: const
scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
Just base::TaskRunner on this one no?

[commit-bot: I haz the power, 2014-01-07 18:34:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/scherkus@chromium.org/66183002/800001

[commit-bot: I haz the power, 2014-01-07 21:05:52]

Retried try job too often on win_rel for step(s) nacl_integration
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[scherkus (not reviewing), 2014-01-07 21:42:47]

Committed patchset #3 manually as r243390 (presubmit successful).