Roll src/third_party/webrtc 8f47b27268ea..6c08e4b57d48 (5 commits)

https://webrtc.googlesource.com/src.git/+log/8f47b27268ea..6c08e4b57d48

git log 8f47b27268ea..6c08e4b57d48 --date=short --first-parent --format='%ad %ae %s'
2020-03-11 marinaciocea@webrtc.org Remove deprecated RtpVideoStreamReceiver constructor.
2020-03-11 danilchap@webrtc.org Cleanup RtcpReceiver tests
2020-03-11 terelius@webrtc.org Scale unacked_data consistently in RobustThroughputEstimator
2020-03-11 mbonadei@webrtc.org Revert "Reland "Whitespace change to kick bots.""
2020-03-11 mbonadei@webrtc.org Reland "Whitespace change to kick bots."

Created with:
  gclient setdep -r src/third_party/webrtc@6c08e4b57d48

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: If77e55490b9085f777cdb30e0bbd452e6b607dd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097840Reviewed-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@{#749341}

DEPS

@@ -1454,7 +1454,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '84ee597cdeae08bb26e578fc66a35bcf35f633f4',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '8f47b27268ea52848fe30447a716573299e574ca',
+    Var('webrtc_git') + '/src.git' + '@' + '6c08e4b57d48f498f61409b58b6bf9493fec74ce',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),