Revert 237311 "Added an "enable-audio-processor" flag and WebRtc..."

Revert 237311 "Added an "enable-audio-processor" flag and WebRtc..."

> Added an "enable-audio-processor" flag and WebRtcAudioProcessor class.
> 
> 
> This CL is a break-down CL from https://codereview.chromium.org/37793005. As the first step to move WebRtc APM to Chrome, it adds a enable-audio-processor command line flag, the WebRtcAudioProcessor class and its unittest.
> WebRtcAudioProcessor is not hooked up the any of the code in Chrome yet, but it will be exercised and tested by its unittest.
> 
> 
> BUG=264611
> TEST=content_unittest
> 
> Review URL: https://codereview.chromium.org/54383003

TBR=xians@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=237334

[no longer working on chromium, 2013-11-26 14:27:40]

Committed patchset #1 manually as r237334.