Roll WebRTC from 704fb55255c8 to 3a5742c880b4 (1 revision)

https://webrtc.googlesource.com/src.git/+log/704fb55255c8..3a5742c880b4

2020-05-20 tommi@webrtc.org Add thread/sequence checks to ModuleRtpRtcpImpl.

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: I410fe76663742869cca4612beccf757ee6a60e34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210644Reviewed-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@{#770726}

DEPS

@@ -1453,7 +1453,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '704fb55255c85cc3b36d91df3209d153bb2f9c02',
+    Var('webrtc_git') + '/src.git' + '@' + '3a5742c880b42003be39652a7ea060c29c322a7f',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),