Revert of Check the current thread in AudioManagerBase::MakeAudio{Output,Input}Stream

Revert of Check the current thread in AudioManagerBase::MakeAudio{Output,Input}Stream (patchset #3 id:40001 of https://codereview.chromium.org/1376313002/ )

Reason for revert:
Seems to break some audio tests.
See https://code.google.com/p/chromium/issues/detail?id=539362

Original issue's description:
> Check the current thread in AudioManagerBase::MakeAudio{Output,Input}Stream
>
> BUG=
> TEST=
> R=tommi@chromium.org,henrika@chromium.org,miu@chromium.org
>
> Committed: https://crrev.com/ca3ac60f80128160b38d099e0c319667cdc60719
> Cr-Commit-Position: refs/heads/master@{#352276}

TBR=miu@chromium.org,tommi@chromium.org,ki.stfu@gmail.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/0f59fe793596ee29f80a2fbcd1a0d06a1dc6a23b
Cr-Commit-Position: refs/heads/master@{#352326}

[henrika (OOO until Aug 14), 2015-10-05 14:51:21]

Created Revert of Check the current thread in
AudioManagerBase::MakeAudio{Output,Input}Stream

[commit-bot: I haz the power, 2015-10-05 14:51:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1384983002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1384983002/1

[commit-bot: I haz the power, 2015-10-05 14:52:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-05 14:53:58]

Patchset 1 (id:??) landed as
https://crrev.com/0f59fe793596ee29f80a2fbcd1a0d06a1dc6a23b
Cr-Commit-Position: refs/heads/master@{#352326}