Roll WebRTC from 12971a22d265 to 5cf0ef0022c7 (15 revisions)

https://webrtc.googlesource.com/src.git/+log/12971a22d265..5cf0ef0022c7

2021-01-18 nisse@webrtc.org Stricter compile-time thread annotations in JsepTransportController
2021-01-18 philipel@webrtc.org Remove unused function VideoDecoder::PrefersLateDecoding.
2021-01-18 alessiob@webrtc.org Remove unused code in APM
2021-01-18 danilchap@webrtc.org Delete unused.h include from api as unused
2021-01-18 nisse@webrtc.org Move deprecated code to their own build targets.
2021-01-18 philipp.hancke@googlemail.com fix variable naming in ReportSdpFormatReceived
2021-01-18 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision da248227..18311e27 (844357:844473)
2021-01-18 philipp.hancke@googlemail.com payload type mapper: use media constants
2021-01-18 nisse@webrtc.org Update pc/ to use C++ lambdas instead of rtc::Bind
2021-01-18 danilchap@webrtc.org Delete RTC_WARN_UNUSED_RESULT as no longer used
2021-01-18 hta@webrtc.org Reland "Improve structuring of test for audio glitches."
2021-01-18 nisse@webrtc.org Update SCTP test to use C++ lambdas instead of rtc::Bind
2021-01-18 mbonadei@webrtc.org Remove deprecated //rtc_base:async_resolver.
2021-01-18 tommi@webrtc.org Remove lock from RtpStreamReceiverController.
2021-01-18 tommi@webrtc.org Reduce redundant flags for audio stream playout state.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/webrtc-chromium-autoroll
Please CC webrtc-chromium-sheriffs-robots@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: chromium:857004
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: Id422e48c8889fa1dc4dca523d1e8446269e6c6b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636477Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#844623}

DEPS

@@ -1515,7 +1515,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '3c2fe3888658d82b47ca831d59a2e07579619c2d',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '12971a22d265c7ba1c3c388f5d487580939a1162',
+    Var('webrtc_git') + '/src.git' + '@' + '5cf0ef0022c7e044fdfed7c511fe9806a2dd7a68',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),