Revert of Switch to STA mode for audio thread and WASAPI I/O streams.

Revert of Switch to STA mode for audio thread and WASAPI I/O streams. (patchset #9 id:200001 of https://codereview.chromium.org/1097553003/)

Reason for revert:
Does not seem to have helped anything, crashes are still present and UMA metrics are unchanged. If anything it may have caused issues like: http://crbug.com/480476 and http://crbug.com/481581

Original issue's description:
> Switch to STA mode for audio thread and WASAPI I/O streams.
>
> Using COM marshalling to share necessary worker thread pointers
> with the render and capture threads.
>
> BUG=422522
> TEST=all unit tests pass, audio input and output work.
>
> Committed: https://crrev.com/43f3b0d25752d924390a4d6fc868d6e9469edc4f
> Cr-Commit-Position: refs/heads/master@{#326360}

TBR=tommi@chromium.org,henrika@chromium.org,mcasas@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=422522
Committed: https://crrev.com/b70e5168cb06cefc077b0cfced369409941c52e4
Cr-Commit-Position: refs/heads/master@{#327115}

[DaleCurtis, 2015-04-27 20:20:33]

Created Revert of Switch to STA mode for audio thread and WASAPI I/O streams.

[commit-bot: I haz the power, 2015-04-27 20:21:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1111503003/1

[commit-bot: I haz the power, 2015-04-27 20:23:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-27 20:23:59]

Patchset 1 (id:??) landed as
https://crrev.com/b70e5168cb06cefc077b0cfced369409941c52e4
Cr-Commit-Position: refs/heads/master@{#327115}