Roll src/third_party/webrtc 83762b21dbd2..496a335a8700 (3 commits)

https://webrtc.googlesource.com/src.git/+log/83762b21dbd2..496a335a8700

git log 83762b21dbd2..496a335a8700 --date=short --first-parent --format='%ad %ae %s'
2020-03-03 jonaso@webrtc.org Add field trials for sending ping on network switches
2020-03-03 srte@webrtc.org Makes Thread::Send execute sent messages after pending posted messages.
2020-03-03 marinaciocea@webrtc.org Transform encoded frame in RTPSenderVideo.

Created with:
  gclient setdep -r src/third_party/webrtc@496a335a8700

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: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I81f92d715644ef4645972b7eceac2be7ee03f9fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083970Reviewed-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@{#746430}

DEPS

@@ -1440,7 +1440,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + 'ec18cc3262922e7dcdbe70243c6f40606f979144',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '83762b21dbd2efbcbed81fefbd0218a99c03c18a',
+    Var('webrtc_git') + '/src.git' + '@' + '496a335a87001a9e65df572ae9b29e038a29f2d5',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),