Roll WebRTC from 812c73cdc25a to 0be184647794 (3 revisions)

https://webrtc.googlesource.com/src.git/+log/812c73cdc25a..0be184647794

2021-01-20 danilchap@webrtc.org Fix enabling DependencyDescriptor for VP9 with spatial layers
2021-01-20 brandtr@webrtc.org Add `.cache` to .gitignore.
2021-01-20 danilchap@webrtc.org Cleanup FakeRtcEventLog from thread awareness

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: I77eefe3f5ed2bc58e611f69a034c24b4c3e19b79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640889Reviewed-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@{#845395}

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' + '@' + '812c73cdc25ade1c08750873f0c1e8f8def206dc',
+    Var('webrtc_git') + '/src.git' + '@' + '0be1846477949c472a7a2bf42134a7bb08570ac4',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),