Roll src/third_party/webrtc/ 70294c8ea..3c706972b (3 commits)

https://webrtc.googlesource.com/src.git/+log/70294c8eab2f..3c706972bad7

$ git log 70294c8ea..3c706972b --date=short --no-merges --format='%ad %ae %s'

Created with:
  roll-dep src/third_party/webrtc


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: Ib690a34c8ca7172f14fc7f1917f61c242c05c948
Reviewed-on: https://chromium-review.googlesource.com/894711
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@{#533265}

DEPS

@@ -649,7 +649,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'd458ada06171a85af00367251a4ed55db7fe2018',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '70294c8eab2f7bcc4678c3b597beda5ee504b47c', # commit position 21742
+    Var('webrtc_git') + '/src.git' + '@' + '3c706972bad7045f20aff74464ed67648e45971b', # commit position 21742
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',