Roll src/third_party/webrtc ed9a401f277b..b6bf0b2546f3 (2 commits)

https://webrtc.googlesource.com/src.git/+log/ed9a401f277b..b6bf0b2546f3

git log ed9a401f277b..b6bf0b2546f3 --date=short --first-parent --format='%ad %ae %s'
2020-01-28 danilchap@webrtc.org Pass picture_id from generic packetizer through codec-specific field
2020-01-28 steveanton@webrtc.org Remove iceRegatherIntervalRange

Created with:
  gclient setdep -r src/third_party/webrtc@b6bf0b2546f3

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: I56ab0ee773b04cf97de1b7cc09eed515b1781589
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026175Reviewed-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@{#736175}

DEPS

@@ -1494,7 +1494,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + 'ec18cc3262922e7dcdbe70243c6f40606f979144',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'ed9a401f277b1d3b6870a0f441341c2103720222',
+    Var('webrtc_git') + '/src.git' + '@' + 'b6bf0b2546f3f5eeec88112431c8a58e86a2e19a',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),