Roll src/third_party/webrtc 00b46f7f2ad1..784630f0e63e (2 commits)

https://webrtc.googlesource.com/src.git/+log/00b46f7f2ad1..784630f0e63e

git log 00b46f7f2ad1..784630f0e63e --date=short --first-parent --format='%ad %ae %s'
2020-04-01 deadbeef@webrtc.org Changing from hard to soft error when temporary DTLS buffer is full.
2020-04-01 sprang@webrtc.org Make prioritized RTX padding default again

Created with:
  gclient setdep -r src/third_party/webrtc@784630f0e63e

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/+/master/autoroll/README.md

Bug: chromium:1063834,chromium:1066442
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: Ice4c62b54ddbfe2248214d2939d6bf252493acec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131719Reviewed-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@{#755330}

DEPS

@@ -1458,7 +1458,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '00b46f7f2ad1af482a9fd104627f32cb5d9ba45c',
+    Var('webrtc_git') + '/src.git' + '@' + '784630f0e63e6cc11cb44eb11db578d913e3d37d',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),