Roll WebRTC 15659:15707 (31 commits)

Changes: https://chromium.googlesource.com/external/webrtc/trunk/webrtc.git/+log/37d7b3f..ba5e7e2

$ git log 37d7b3f..ba5e7e2 --date=short --no-merges --format=%ad %ae %s
2016-12-20 nisse@webrtc.org Delete unused method PayloadRouter::MaxPayloadLength.
2016-12-20 danilchap@webrtc.org Style cleanup in RTCPReceiver Rename variables and private functions to follow style, replace remaining asserts with DCHECKs. add 'ms' suffix to time variables derived from clock_ add 'ntp' suffix to time variables derived from ntp time. No functional changes expected.
2016-12-20 magjed@webrtc.org Revert of Add disabled certificate check support to IceServer PeerConnection API. (patchset #8 id:140001 of https://codereview.webrtc.org/2557803002/ )
2016-12-20 henrik.lundin@webrtc.org Add a unit test for Opus complexity adaptation
2016-12-19 zhihuang@webrtc.org Add an abstract class for IceTransport
2016-12-19 brandtr@webrtc.org Add GUARDED_BY's in FlexfecReceiver.
2016-12-19 brandtr@webrtc.org Clean up storage of FlexFEC payload type in webrtc::VideoCodecSettings.
2016-12-19 danilchap@webrtc.org Revert of Rename RTPVideoHeader.isFirstPacket to .is_first_packet_in_frame. (patchset #1 id:1 of https://codereview.webrtc.org/2574943003/ )
2016-12-19 hbos@webrtc.org Removed undefined method from webrtcsession.h.
2016-12-19 johan@webrtc.org Rename RTPVideoHeader.isFirstPacket to .is_first_packet_in_frame.
2016-12-19 asapersson@webrtc.org Move histogram for number of pause events to per stream:
2016-12-19 kthelgason@webrtc.org Reland of Properly report number of quality downscales in stats. (patchset #1 id:1 of https://codereview.webrtc.org/2586783003/ )
2016-12-19 henrik.lundin@webrtc.org Re-enable Opus complexity tests on Android
2016-12-19 kthelgason@webrtc.org Revert of Properly report number of quality downscales in stats. (patchset #11 id:220001 of https://codereview.webrtc.org/2564373002/ )
2016-12-19 kwiberg@webrtc.org CodecInst operator<<
2016-12-19 asapersson@webrtc.org Reland of Disabling NOTREACHED which we're hitting flakily in browser tests. (patchset #1 id:1 of https://codereview.webrtc.org/2585183002/ )
2016-12-19 brandtr@webrtc.org Add multithreaded fake encoder and corresponding FlexFEC VideoSendStreamTest.
2016-12-19 hbos@webrtc.org Fix segfault when PeerConnection is destroyed during stats collection.
2016-12-19 kthelgason@webrtc.org Properly report number of quality downscales in stats.
2016-12-19 hbos@webrtc.org RTCStatsCollector: Utilize network thread to minimize thread hops.
2016-12-19 philipel@webrtc.org Now expect the correct number of streams in EndToEndTest.GetStats.
2016-12-19 hnsl@webrtc.org Add disabled certificate check support to IceServer PeerConnection API.
2016-12-19 denicija@webrtc.org Add QP stats to the statsview in AppRTCMobile for ios.
2016-12-19 henrik.lundin@webrtc.org Revert of Re-enable Opus complexity tests on Android (patchset #1 id:1 of https://codereview.webrtc.org/2589673002/ )
2016-12-19 henrik.lundin@webrtc.org Re-enable Opus complexity tests on Android
2016-12-19 brandtr@webrtc.org Move FlexfecReceiveStream from api/call/ to call/.
2016-12-18 asapersson@webrtc.org Revert of Disabling NOTREACHED which we're hitting flakily in browser tests. (patchset #1 id:1 of https://codereview.webrtc.org/2477663002/ )
2016-12-18 kjellander@webrtc.org Move tools/mb -> tools-webrtc/mb
2016-12-17 magjed@webrtc.org Put iOS H264 High profile under a field trial
2016-12-17 kjellander@webrtc.org Move tools/valgrind-webrtc -> tools-webrtc/valgrind
2016-12-16 skvlad@webrtc.org Revert of Delete unused code from systeminfo. (patchset #3 id:40001 of https://codereview.webrtc.org/2578323005/ )

TBR=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_archive_rel_ng;master.tryserver.chromium.mac:mac_chromium_archive_rel_ng
BUG=

Review-Url: https://codereview.chromium.org/2588273003
Cr-Commit-Position: refs/heads/master@{#439786}

DEPS

@@ -228,7 +228,7 @@ deps = {
     Var('chromium_git') + '/native_client/src/third_party/scons-2.0.1.git' + '@' + '1c1550e17fc26355d08627fbdec13d8291227067',
 
   'src/third_party/webrtc':
-    Var('chromium_git') + '/external/webrtc/trunk/webrtc.git' + '@' + '37d7b3f005b6b432d3e6fbfca5956e8165b334d1', # commit position 15659
+    Var('chromium_git') + '/external/webrtc/trunk/webrtc.git' + '@' + 'ba5e7e291afb87d7eccf524fa26f0ed81f8a34cd', # commit position 15707
 
   'src/third_party/openmax_dl':
     Var('chromium_git') + '/external/webrtc/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),