Roll src/third_party/webrtc/ 1b4059e84..6bf70d20d (3 commits)

https://webrtc.googlesource.com/src.git/+log/1b4059e84f5f..6bf70d20daa9

$ git log 1b4059e84..6bf70d20d --date=short --no-merges --format='%ad %ae %s'

Created with:
  roll-dep src/third_party/webrtc


Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


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

Change-Id: I432dcae24606641f6d91f9287575673909b25027
Reviewed-on: https://chromium-review.googlesource.com/724170Reviewed-by: WebRTC Roll Bot <webrtc-autoroll@chromium.org>
Commit-Queue: WebRTC Roll Bot <webrtc-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509602}

DEPS

@@ -590,7 +590,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '34842fa3c36988840c89f5bc6a68503175acf7d9',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '1b4059e84f5f58c68844cb1b91ce23390c03348a', # commit position 20237
+    Var('webrtc_git') + '/src.git' + '@' + '6bf70d20daa9fb4f8baf9801ef953e6f4db18484', # commit position 20237
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',