Roll WebRTC from 46129e98d33a to 52c138e36e87 (11 revisions)

https://webrtc.googlesource.com/src.git/+log/46129e98d33a..52c138e36e87

2020-10-14 olka@webrtc.org Revert "Improve screen sharing with PipeWire on Wayland"
2020-10-14 perkj@webrtc.org Add RtpVideoSender::SendVideoLayersAllocation
2020-10-14 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 6aee44cd..51f6153d (816729:816858)
2020-10-14 roman.gaiu@ringcentral.com Improve checks for "child" windows of selected capture targets.
2020-10-13 sprang@webrtc.org Makes WebRTC-Pacer-SmallFirstProbePacket default enabled.
2020-10-13 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 144d0d0b..6aee44cd (816585:816729)
2020-10-13 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 7c745202..144d0d0b (816476:816585)
2020-10-13 nisse@webrtc.org Add back AndroidVideoBuffer::CropAndScale
2020-10-13 ilnik@webrtc.org Reland "Remove deprecated video_frame_i420 build target"
2020-10-13 eshr@google.com Use VideoFrameBuffer::Scale in encoder wrappers
2020-10-13 grulja@gmail.com Improve screen sharing with PipeWire on Wayland

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:1132299,chromium:682122
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: If89f53e660b0529ca86cfd42e99c473f95c5ca3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470742Reviewed-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@{#816992}

DEPS

@@ -1490,7 +1490,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '46129e98d33a4d97c7d24252b1e67e83844112fa',
+    Var('webrtc_git') + '/src.git' + '@' + '52c138e36e877fe4275726031d74e501f49f14bb',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),