Roll src/third_party/webrtc/ e63afff36..31a12c557 (15 commits)

https://webrtc.googlesource.com/src.git/+log/e63afff36496..31a12c557dcd

$ git log e63afff36..31a12c557 --date=short --no-merges --format='%ad %ae %s'

Created with:
  roll-dep src/third_party/webrtc
BUG=None,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: I8c0d39963bc29a0d4aabf6774b5747bcd6ce6f15
Reviewed-on: https://chromium-review.googlesource.com/962341
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@{#543067}

DEPS

@@ -657,7 +657,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '3c1cb0203b6cfc10389e85a350b2ea6ca29d01ce',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'e63afff36496c78c3fac1fc8d5dedc6553870e74', # commit position 21742
+    Var('webrtc_git') + '/src.git' + '@' + '31a12c557dcd84a31f9c3f2d8858d9646c2a3135', # commit position 21742
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',