Revert of Allow intelligibility to compile in apm

Revert of Allow intelligibility to compile in apm (patchset #1 id:1 of https://codereview.webrtc.org/1182323005/)

Reason for revert:
Breaking the build bots: http://build.chromium.org/p/client.webrtc/builders/Mac32%20Release%20%5Blarge%20tests%5D/builds/4544

Fails to compile with this error:

../../webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc:218:25: error: no member named 'accumulate' in namespace 'std'
    power_target = std::accumulate(clear_variance_.variance(),

Original issue's description:
> Allow intelligibility to compile in apm
>
> - Added files to gyp and BUILD
> - Made minor fixes to get everything to compile
>     and intelligibility_proc to run
> - Added comments
> - Auto-reformatting
>
> Original cl is at: https://webrtc-codereview.appspot.com/57579004/
>
> TBR=aluebs@webrtc.org
>
> Committed: https://chromium.googlesource.com/external/webrtc/+/b7553dfdbb1ca7779eb0d80b5f509523c9b00086

TBR=ekmeyerson@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/c555b99c13aa25cf891dd34602f1b620b3f33bfb
Cr-Commit-Position: refs/heads/master@{#9455}

[aluebs-webrtc, 2015-06-17 03:25:57]

Created Revert of Allow intelligibility to compile in apm

[commit-bot: I haz the power, 2015-06-17 03:26:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1187033005/1

[commit-bot: I haz the power, 2015-06-17 03:26:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-17 03:26:31]

Patchset 1 (id:??) landed as
https://crrev.com/c555b99c13aa25cf891dd34602f1b620b3f33bfb
Cr-Commit-Position: refs/heads/master@{#9455}