Roll src/third_party/webrtc 224c69d52748..a2dae38ee772 (4 commits)

https://webrtc.googlesource.com/src.git/+log/224c69d52748..a2dae38ee772

git log 224c69d52748..a2dae38ee772 --date=short --no-merges --format='%ad %ae %s'
2019-08-22 nisse@webrtc.org Revert "Reland "Delete mac_utils.h and mac_utils.cc""
2019-08-22 chxg@google.com Add helper classes to send and receive abs-capture-time extensions.
2019-08-22 jonasolsson@webrtc.org Remove unused framerate parameter from simulcast bitrate allocator.
2019-08-22 nisse@webrtc.org Reland "Delete mac_utils.h and mac_utils.cc"

Created with:
  gclient setdep -r src/third_party/webrtc@a2dae38ee772

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:None,chromium:None
Change-Id: Id66c3da8c217369c5cc2d4fc0a8f8afacb4e2c3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764939Reviewed-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@{#689427}

DEPS

@@ -1391,7 +1391,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'abaae129d9a0c6e1e092067e0b105475df43352e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '224c69d5274875f39220172f2a983a6371190b15',
+    Var('webrtc_git') + '/src.git' + '@' + 'a2dae38ee7729ec1d6fcb7d22b7a597c627ad81a',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',