Revert of Chromecast: Play audio streams not supported by CMA via default renderer

Revert of Chromecast: Play audio streams not supported by CMA via default renderer (patchset #5 id:70001 of https://codereview.chromium.org/973633002/)

Reason for revert:
Audio tests started failing consistently in the next build after this was checked in. See:
https://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests/builds/3762

Not sure if this CL is the culprit, but seems the most likely one, so attempting a revert to see if it fixes the problem.

Error:
[ RUN      ] AudioRecorderTest.BasicRecordAndStop
../../components/audio_modem/audio_recorder_unittest.cc:203: Failure
Value of: IsRecording()
Actual: false
Expected: true
../../components/audio_modem/audio_recorder_unittest.cc:208: Failure
Value of: IsRecording()
Actual: false
Expected: true
../../components/audio_modem/audio_recorder_unittest.cc:213: Failure
Value of: IsRecording()
Actual: false
Expected: true
[  FAILED  ] AudioRecorderTest.BasicRecordAndStop (1292 ms)

Original issue's description:
> Chromecast: Play audio streams not supported by CMA via default renderer
>
> For Chromecast we want to choose which media renderer to use based on
> the types of input content streams. We will use CMA media renderer for
> media types that are supported by our hardware (H264, AAC, etc) and
> will use the default media renderer for audio streams other than AAC
> or Vorbis. This will allow us support software decoding of FLAC and
> Opus via the default Chrome audio path.
>
> BUG=457959
>
> Committed: https://crrev.com/2e583073b996e66d62f709dd2ffde9e1ef58b276
> Cr-Commit-Position: refs/heads/master@{#318941}

TBR=gunsch@chromium.org,lcwu@chromium.org,dalecurtis@chromium.org,servolk@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=457959
Committed: https://crrev.com/ee687fd9c6c2bc41642cd8b65de87fe548a3cf75
Cr-Commit-Position: refs/heads/master@{#319033}

[Finnur, 2015-03-04 08:42:07]

Created Revert of Chromecast: Play audio streams not supported by CMA via
default renderer

[commit-bot: I haz the power, 2015-03-04 08:42:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/981473003/1

[commit-bot: I haz the power, 2015-03-04 08:43:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 08:43:48]

Patchset 1 (id:??) landed as
https://crrev.com/ee687fd9c6c2bc41642cd8b65de87fe548a3cf75
Cr-Commit-Position: refs/heads/master@{#319033}

[Finnur, 2015-03-04 09:57:46]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/967933003/ by finnur@chromium.org.

The reason for reverting is: Hmmm... My revert did not fix the test, so I'm
undoing it. :/.