Roll src/third_party/webrtc d5a7838926b8..198345898168 (2 commits)

https://webrtc.googlesource.com/src.git/+log/d5a7838926b8..198345898168

git log d5a7838926b8..198345898168 --date=short --no-merges --format='%ad %ae %s'
2019-11-05 peah@webrtc.org Revert "Reland "Correct AEC3 multichannel functionality activation""
2019-11-05 mbonadei@webrtc.org Add 3 missing RTC_EXPORT.

Created with:
  gclient setdep -r src/third_party/webrtc@198345898168

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: Icc60a0357c7eff4a80abed6ed15ad14e4b7086e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899180Reviewed-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@{#712575}

DEPS

@@ -1512,7 +1512,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'dd55f3ca8f2ea716ca917a4aaf36f0729fe902b1',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'd5a7838926b839469db1072d72a92e6814f2faeb',
+    Var('webrtc_git') + '/src.git' + '@' + '19834589816862778546b41154e9a7d4c0c30ca2',
 
   # Wuffs' canonical repository is at github.com/google/wuffs, but we use
   # Skia's mirror of Wuffs, the same as in upstream Skia's DEPS file.