Roll WebRTC from c6d6e06a5c45 to 2c9d76a4eb0f (1 revision)

https://webrtc.googlesource.com/src.git/+log/c6d6e06a5c45..2c9d76a4eb0f

2020-06-18 eshr@google.com Use DataRates in QualityRampUpExperimentHelper

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: I508024aa1d86877043bc2e6aa2714a0b582faab3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251726Reviewed-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@{#779769}

DEPS

@@ -1452,7 +1452,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'c6d6e06a5c45d1e4ce83b1fb8e401a422aee5e70',
+    Var('webrtc_git') + '/src.git' + '@' + '2c9d76a4eb0fcdf50a03cb4a41b8a43ad16f9c6b',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),