Revert of Roll WebRTC 7972:8027, Libjingle 7972:8026

Revert of Roll WebRTC 7972:8027, Libjingle 7972:8026 (patchset #1 id:1 of https://codereview.chromium.org/842143002/)

Reason for revert:
Appears to be causing flakiness on Mac on waterfall

http://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%29?numbuilds=200

failing e.g.

WebRtcBrowserTest.CanSetupLegacyCall
WebRtcBrowserTest.NegotiateOfferWithBLine
WebRtcBrowserTest.CanSetupAudioAndVideoCall

http://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%29/builds/1779/steps/content_browsertests%20on%20Mac-10.9/logs/CanSetupLegacyCall

Original issue's description:
> Roll WebRTC 7972:8027, Libjingle 7972:8026
>
> WebRTC 7972:8027
> Changes: https://chromium.googlesource.com/external/webrtc/trunk/webrtc.git/+log/c2c971d..f19180d
>
> Libjingle 7972:8026
> Changes: https://chromium.googlesource.com/external/webrtc/trunk/talk.git/+log/1aaae71..22a0397
>
> BUG=NONE
> TBR=tommi
>
> Committed: https://chromium.googlesource.com/chromium/src/+/90a0f4b3a1b78e4e4b9bf9081fea0265cc9b266b

TBR=henrika@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=NONE

Committed: https://crrev.com/681d67f35b8c7b07130c2fb8c1111911ac7389a7
Cr-Commit-Position: refs/heads/master@{#310800}

[scottmg, 2015-01-09 18:25:56]

Created Revert of Roll WebRTC 7972:8027, Libjingle 7972:8026

[commit-bot: I haz the power, 2015-01-09 18:27:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/839173004/1

[commit-bot: I haz the power, 2015-01-09 18:29:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-09 18:29:52]

Patchset 1 (id:??) landed as
https://crrev.com/681d67f35b8c7b07130c2fb8c1111911ac7389a7
Cr-Commit-Position: refs/heads/master@{#310800}