Roll WebRTC from 5c8aa5cd05ae to 71d7c8e3cdd6 (2 revisions)

https://webrtc.googlesource.com/src.git/+log/5c8aa5cd05ae..71d7c8e3cdd6

2020-09-12 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 9d73c26f..1b3e75b8 (806356:806461)
2020-09-12 tommi@webrtc.org Make MessageHandler ctor explicitly require 'false'.

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: Ief46f3168ae7312eee7eb42b52acdae6fbb4706f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2408064Reviewed-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@{#806476}

DEPS

@@ -1471,7 +1471,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '5c8aa5cd05ae56ac783145a04ed21c5ebd2dfc4d',
+    Var('webrtc_git') + '/src.git' + '@' + '71d7c8e3cdd61b69d09fc392b93cc8c461168f0d',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),