Roll WebRTC from e6fa238f76e5 to 71002a226ac5 (5 revisions)

https://webrtc.googlesource.com/src.git/+log/e6fa238f76e5..71002a226ac5

2020-10-26 danilchap@webrtc.org Add layer skipping to L2T2_KEY_SHIFT structure
2020-10-26 hta@webrtc.org Break circular dependency on WebRtcSessionDescriptionFactory
2020-10-26 hta@webrtc.org Change PeerConnection creation to use a static "Create" method
2020-10-26 nisse@webrtc.org Delete unneeded includes of system_wrappers/include/sleep.h
2020-10-26 hta@webrtc.org Remove forwarding header media_stream_track.h

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: I1b72f328833fc629a9301e42d98e80a478662c05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498087Reviewed-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@{#820791}

DEPS

@@ -1497,7 +1497,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'e6fa238f76e50a8caa0547074f75443bbfd7b986',
+    Var('webrtc_git') + '/src.git' + '@' + '71002a226ac53f5a8ae2eb403fa4269adecc52c1',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),