Roll src/third_party/webrtc/ 3e77afd0d..15fb91591 (4 commits)

https://webrtc.googlesource.com/src.git/+log/3e77afd0d29b..15fb915917f7

$ git log 3e77afd0d..15fb91591 --date=short --no-merges --format='%ad %ae %s'

Created with:
  roll-dep src/third_party/webrtc
BUG=None


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

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.


CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_archive_rel_ng;master.tryserver.chromium.mac:mac_chromium_archive_rel_ng;master.tryserver.chromium.win:win-msvc-dbg
TBR=webrtc-chromium-sheriffs-robots@google.com

Change-Id: I3ba00c4094f930ed70fb207d17d1b988d76833a9
Reviewed-on: https://chromium-review.googlesource.com/959544
Commit-Queue: webrtc-chromium-autoroll <webrtc-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: webrtc-chromium-autoroll <webrtc-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#542642}

DEPS

@@ -657,7 +657,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '3c1cb0203b6cfc10389e85a350b2ea6ca29d01ce',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '3e77afd0d29bdfcd0e522ebcc46f160d38538fa2', # commit position 21742
+    Var('webrtc_git') + '/src.git' + '@' + '15fb915917f7a4c49f856d280c147d1177a59738', # commit position 21742
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',