Roll src/third_party/webrtc 703a5d76d9ba..c8ff1600d39e (2 commits)

https://webrtc.googlesource.com/src.git/+log/703a5d76d9ba..c8ff1600d39e

git log 703a5d76d9ba..c8ff1600d39e --date=short --first-parent --format='%ad %ae %s'
2020-02-05 steveanton@webrtc.org Don't crash when renegotiating after the peer rejects data channels
2020-02-05 kwiberg@webrtc.org Send bandwidth updates to all codecs, not just Opus

Created with:
  gclient setdep -r src/third_party/webrtc@c8ff1600d39e

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: Ife7589f652522f8c4c8d44379b2e5f6824cf2275
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040020Reviewed-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@{#738808}

DEPS

@@ -1463,7 +1463,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + 'ec18cc3262922e7dcdbe70243c6f40606f979144',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '703a5d76d9ba8e7984509cc7bf70fb4ed84ef6be',
+    Var('webrtc_git') + '/src.git' + '@' + 'c8ff1600d39e66e8ff373c1fefcea3570349cb44',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),