Roll src/third_party/webrtc 8d3e4bd9a6c5..add7ef974ee2 (2 commits)

https://webrtc.googlesource.com/src.git/+log/8d3e4bd9a6c5..add7ef974ee2

git log 8d3e4bd9a6c5..add7ef974ee2 --date=short --no-merges --format='%ad %ae %s'
2019-07-31 steveanton@webrtc.org Sanitize the codec list before sending it to the media engine
2019-07-31 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 6ba1e902..1bdd7918 (682701:682806)

Created with:
  gclient setdep -r src/third_party/webrtc@add7ef974ee2

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:987598,chromium:None
Change-Id: Iee06110bb188a1a97da12aea3c59baea47c739f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1729840Reviewed-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@{#682983}

DEPS

@@ -1375,7 +1375,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'abaae129d9a0c6e1e092067e0b105475df43352e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '8d3e4bd9a6c5ca684e01e1daa1784a3bdaf9f125',
+    Var('webrtc_git') + '/src.git' + '@' + 'add7ef974ee2642a3b55a36ec80be50a615bc60a',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',