Revert of Roll WebRTC 8176:8203, Libjingle 8174:8202

Revert of Roll WebRTC 8176:8203, Libjingle 8174:8202 (patchset #2 id:20001 of https://codereview.chromium.org/885003003/)

Reason for revert:
Appears to have broken Mac browser tests:

 - WebRtcSimulcastBrowserTest.TestVgaReturnsTwoSimulcastStreams
 - WebRtcBrowserTest.RunsAudioVideoWebRTCCallInTwoTabs

[75316:29699:0129/074049:FATAL:overuse_frame_detector.cc(388)] Check failed: processing_thread_.CalledOnValidThread().
0   libbase.dylib                       0x0000000119eaf88f base::debug::StackTrace::StackTrace() + 47
1   libbase.dylib                       0x0000000119eaf8e3 base::debug::StackTrace::StackTrace() + 35
2   libbase.dylib                       0x0000000119f09076 logging::LogMessage::~LogMessage() + 70
3   libbase.dylib                       0x0000000119f080c3 logging::LogMessage::~LogMessage() + 35
4   libcontent.dylib                    0x000000012ce82cd5 webrtc::OveruseFrameDetector::TimeUntilNextProcess() + 245
5   libcontent.dylib                    0x000000012c8dfdfd webrtc::ProcessThreadImpl::Process() + 525
6   libcontent.dylib                    0x000000012c8df836 webrtc::ProcessThreadImpl::Run(void*) + 38
7   libcontent.dylib                    0x000000012c6ce390 webrtc::ThreadPosix::Run() + 288
8   libcontent.dylib                    0x000000012c6ce076 webrtc::StartThread(void*) + 38
9   libsystem_pthread.dylib             0x00007fff8fe5f899 _pthread_body + 138
10  libsystem_pthread.dylib             0x00007fff8fe5f72a _pthread_struct_init + 0
11  libsystem_pthread.dylib             0x00007fff8fe63fc9 thread_start + 13

https://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%29/builds/2438

Original issue's description:
> Roll WebRTC 8176:8203, Libjingle 8174:8202
>
> WebRTC 8176:8203
> Changes: https://chromium.googlesource.com/external/webrtc/trunk/webrtc.git/+log/9fbfe8f..7b9e261
>
> Libjingle 8174:8202
> Changes: https://chromium.googlesource.com/external/webrtc/trunk/talk.git/+log/6660ffc..237ae43
>
> TBR=kjellander@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/8aa707b5aa26cead2ab4791672163337c92f904b

TBR=kjellander@chromium.org,tommi@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/23f2a56e6ed4103fc3b8d20fe8f2f4f272cab311
Cr-Commit-Position: refs/heads/master@{#313714}

[please use gerrit instead, 2015-01-29 15:55:41]

Created Revert of Roll WebRTC 8176:8203, Libjingle 8174:8202

[commit-bot: I haz the power, 2015-01-29 15:56:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/888593002/1

[commit-bot: I haz the power, 2015-01-29 15:57:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-29 15:58:34]

Patchset 1 (id:??) landed as
https://crrev.com/23f2a56e6ed4103fc3b8d20fe8f2f4f272cab311
Cr-Commit-Position: refs/heads/master@{#313714}