Roll WebRTC from f867ba8b5d48 to 5401bad7015d (5 revisions)

https://webrtc.googlesource.com/src.git/+log/f867ba8b5d48..5401bad7015d

2020-08-11 nisse@webrtc.org Prepare for deleting VideoCodec::plType
2020-08-11 dharmesh.r.chauhan@gmail.com Disable switch camera and route change buttons when processing
2020-08-11 titovartem@webrtc.org Move initialization of GoogleMock and flags to main from test_main_lib
2020-08-11 philipp.hancke@googlemail.com video_replay: wrap main thread
2020-08-11 hta@webrtc.org Reland "Implement transceiver.stop()"

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:980879
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I0f20716350e06947f7d98ebcf9908ccec75a7ec0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2349390Reviewed-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@{#796934}

DEPS

@@ -1470,7 +1470,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'f867ba8b5d48f4c2ff510380db287e1c6c367d4f',
+    Var('webrtc_git') + '/src.git' + '@' + '5401bad7015d510be212efa1e3d3bc1c149bc77c',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),