Roll src/third_party/webrtc 30ab015fc908..4271afbc301e (1 commits)

https://webrtc.googlesource.com/src.git/+log/30ab015fc908..4271afbc301e

git log 30ab015fc908..4271afbc301e --date=short --no-merges --format='%ad %ae %s'
2019-08-27 yinwa@webrtc.org Fix the bug and reland "Make min video target bitrate configurable."

Created with:
  gclient setdep -r src/third_party/webrtc@4271afbc301e

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

TBR=webrtc-chromium-sheriffs-robots@google.com

Bug: None
Change-Id: I7a40307e9952f86004454ba8235fc3a590ab1f3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771195Reviewed-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@{#690739}

DEPS

@@ -1408,7 +1408,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'abaae129d9a0c6e1e092067e0b105475df43352e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '30ab015fc908e766b9da9a825f1e39b53c9a387b',
+    Var('webrtc_git') + '/src.git' + '@' + '4271afbc301e3a480adc4b78766179440eeceb2c',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',