Roll WebRTC from 0be184647794 to 49b20f919abe (2 revisions)

https://webrtc.googlesource.com/src.git/+log/0be184647794..49b20f919abe

2021-01-21 deadbeef@webrtc.org Fix race with SctpTransport destruction and usrsctp timer thread.
2021-01-20 peah@webrtc.org Allow separate dump sets for the data dumper in APM

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:1162424
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I5bc6e013069836d57d9401c39ea4313969267d11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641483Reviewed-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@{#845549}

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' + '@' + '0be1846477949c472a7a2bf42134a7bb08570ac4',
+    Var('webrtc_git') + '/src.git' + '@' + '49b20f919abe9a21227b0f6f86d223a3fb1e5ee4',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),