Roll WebRTC from cf8ec1f68676 to 8592111e458d (20 revisions)

https://webrtc.googlesource.com/src.git/+log/cf8ec1f68676..8592111e458d

2020-12-16 mbonadei@webrtc.org Add empty header to simplify Chromium migration.
2020-12-16 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 85af6214..6370178a (837534:837763)
2020-12-16 nisse@webrtc.org Don't instantiate any CallStats object in RtpVideoSender tests
2020-12-16 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 708cc13d..85af6214 (835045:837534)
2020-12-16 handellm@webrtc.org VideoReceiveStream: eliminate task post in decode path.
2020-12-16 landrey@webrtc.org Lower HighBitrateAV1 liabom test quality threshold
2020-12-16 philipp.hancke@googlemail.com sdp: ignore legacy sctpmap line
2020-12-16 philipp.hancke@googlemail.com doc: update working-with-native-branches information
2020-12-16 mbonadei@webrtc.org Optimize calls to std::string::find() and friends for a single char.
2020-12-16 hta@webrtc.org Add a Clone() method to SessionDescriptionInterface
2020-12-15 sprang@webrtc.org VideoCodecTextFixture and YuvFrameReader improvements.
2020-12-15 auorion@microsoft.com Refactor test window creation functions to be reusable.
2020-12-15 perkj@webrtc.org Add unit test ReportsUpdatedVideoLayersAllocationWhenResolutionChanges
2020-12-15 gustaf@webrtc.org Surface the number of encoded channels
2020-12-15 nisse@webrtc.org Clarify thread/TaskQueue requirements for internal::CallStats
2020-12-15 devicentepena@webrtc.org Fixing the bounds for the max and min erle in the erle instantaneous estimation.
2020-12-15 mbonadei@webrtc.org Refresh rtc_base/OWNERS.
2020-12-15 mbonadei@webrtc.org Fix typo in auto-updater.
2020-12-15 jonaso@webrtc.org Add last_data_sent timestamp to Connection.
2020-12-15 mbonadei@webrtc.org Fix Authors Check presubmit.

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: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: Ib099dc7e34eb9d55b3642c1b612e9f7a5758a320
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595348Reviewed-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@{#837942}

DEPS

@@ -1543,7 +1543,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '3c2fe3888658d82b47ca831d59a2e07579619c2d',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'cf8ec1f6867651204d81b14a8c31a86e6eb97572',
+    Var('webrtc_git') + '/src.git' + '@' + '8592111e458d253e53806db65d23d21bfe9d9db4',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),