Roll WebRTC from 11215febb950 to 8df643b38785 (2 revisions)

https://webrtc.googlesource.com/src.git/+log/11215febb950..8df643b38785

2021-01-22 danilchap@webrtc.org Introduce FinalRefCountedObject template class
2021-01-22 hta@webrtc.org Monitor the "concealed samples" stat for the audio during negotiation.

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: If4f5d77302c5705ad83d952b0cb1b9c48954e224
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2645366Reviewed-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@{#846329}

DEPS

@@ -1504,7 +1504,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '66460536ee975a3e98931b7b40a661a63fd9cd57',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '11215febb9500c597c940a40f1b9fe86c939413f',
+    Var('webrtc_git') + '/src.git' + '@' + '8df643b38785f9b6fe8ae4bbf295839d28136d08',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),