Roll WebRTC from 820021d24600 to 0c5f244817c2 (3 revisions)

https://webrtc.googlesource.com/src.git/+log/820021d24600..0c5f244817c2

2020-07-16 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 46d8bf63..d8502113 (789115:789218)
2020-07-16 auorion@microsoft.com Implement Source enumeration and selection for WGC capturer
2020-07-16 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision ef63f40c..46d8bf63 (789011:789115)

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: I986c21f584ba4d8d37b8113a61e9b54ebaaf245a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303864Reviewed-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@{#789342}

DEPS

@@ -1480,7 +1480,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '820021d24600b8628b8644c43fddf67fa37ccf84',
+    Var('webrtc_git') + '/src.git' + '@' + '0c5f244817c22303d65811e6a25b3d97f8a08127',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),