Roll WebRTC from 2d27b1ab0c85 to 8498c259b987 (3 revisions)

https://webrtc.googlesource.com/src.git/+log/2d27b1ab0c85..8498c259b987

2020-06-10 philipp.hancke@googlemail.com test: use kCnCodecName instead of hardcoding "CN"
2020-06-10 hbos@webrtc.org [Stats flake] Mark outbound-rtp.framesPerSecond as optional.
2020-06-10 jakobi@webrtc.org Remove packet loss rate optimization and minimum field trial.

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: I085c0117ff4adee1de38fdb045528907f7453039
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2239477Reviewed-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@{#776915}

DEPS

@@ -1452,7 +1452,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '2d27b1ab0c851b24a8060147147960c28a3f38bb',
+    Var('webrtc_git') + '/src.git' + '@' + '8498c259b98760eb8c40a8313a9ecf7bb69c0cdb',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),