Roll src/third_party/webrtc 13a8e162476b..a043b2ba46b9 (3 commits)

https://webrtc.googlesource.com/src.git/+log/13a8e162476b..a043b2ba46b9

git log 13a8e162476b..a043b2ba46b9 --date=short --no-merges --format='%ad %ae %s'
2019-10-22 thaloun@chromium.org Support case where win32socketserver's window class is not unregistered properly.
2019-10-22 gustaf@webrtc.org AnalyzeReverseStream with StreamConfig
2019-10-22 kron@webrtc.org Add per frame decode time histograms for 4k/HD and VP9/H264

Created with:
  gclient setdep -r src/third_party/webrtc@a043b2ba46b9

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: chromium:b/140961297,chromium:1007526
Change-Id: I98321daa4f025b92f013ca794a90a158bc48df0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873494Reviewed-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@{#708292}

DEPS

@@ -1477,7 +1477,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '2701c130839edbeb226735b0775966b6423d9e83',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '13a8e162476b6df15e283cea2aeb9650078d7fa9',
+    Var('webrtc_git') + '/src.git' + '@' + 'a043b2ba46b9f81f1a679f36e1945fc7802f8201',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',