Fix potential deadlock situation for ChromeOS sounds.

Fix potential deadlock situation for ChromeOS sounds.

Lock order was inverted while stopping the stream which can lead
to deadlock.

BUG=327817, 374135
TEST=No more lock inversion warning from TSANv2.
R=ajwong@chromium.org, dgreid@chromium.org
TBR=awong

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278885

[DaleCurtis, 2014-06-20 20:27:20]

dgreid: I think this may be the source of hangs reported on
http://crbug.com/327817  WDYT?

[DaleCurtis, 2014-06-20 20:39:38]

TBR=awong for base/debug/tsan_suppressions.cc update.

[awong, 2014-06-20 20:40:38]

LGTM

[dgreid, 2014-06-20 21:02:51]

On 2014/06/20 20:27:20, DaleCurtis wrote:
> dgreid: I think this may be the source of hangs reported on
> http://crbug.com/327817  WDYT?

That seems possible.  We never got a good set or repro steps, so we'll have to
watch the UMA stat before and after this change to see if it is affected.

[dgreid, 2014-06-20 21:09:03]

lgtm

[DaleCurtis, 2014-06-20 21:09:39]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2014-06-20 21:12:28]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dalecurtis@chromium.org/348843004/20001

[DaleCurtis, 2014-06-21 01:07:58]

Committed patchset #2 manually as r278885 (presubmit successful).