Roll src/third_party/webrtc cdbaeeb73767..9b1700cfaef9 (2 commits)

https://webrtc.googlesource.com/src.git/+log/cdbaeeb73767..9b1700cfaef9

git log cdbaeeb73767..9b1700cfaef9 --date=short --no-merges --format='%ad %ae %s'
2019-08-05 orphis@webrtc.org Enable field trial LegacySimulcastLayerLimit by default
2019-08-05 peah@webrtc.org AEC3: Removing unused code in the echo subtractor

Created with:
  gclient setdep -r src/third_party/webrtc@9b1700cfaef9

The AutoRoll server is located here: https://autoroll.skia.org/r/webrtc-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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

Bug: chromium:990823
Change-Id: Id638fa2e5f750a0d8fa719f9e98d0352c07fc63f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1735951Reviewed-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@{#684115}

DEPS

@@ -1375,7 +1375,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'abaae129d9a0c6e1e092067e0b105475df43352e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'cdbaeeb737676f69419ff4a73229a6c6df4549ff',
+    Var('webrtc_git') + '/src.git' + '@' + '9b1700cfaef90529f61da54a4f0676928f7dd2c5',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',