Roll src/third_party/webrtc ab56670af981..a34d7766c56a (6 commits)

https://webrtc.googlesource.com/src.git/+log/ab56670af981..a34d7766c56a


git log ab56670af981..a34d7766c56a --date=short --no-merges --format='%ad %ae %s'
2019-02-01 nisse@webrtc.org Move RtpSenderAudioTest to its own file
2019-02-01 mbonadei@webrtc.org [clang-tidy] Apply performance-move-const-arg fixes.
2019-02-01 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision ecc3b419..6893a4aa (628213:628317)
2019-02-01 nisse@webrtc.org Delete sequence number save and restore in ChannelSend.
2019-02-01 mbonadei@webrtc.org Fix RTCStatsReport::ConstIterator move constructor.
2019-02-01 eladalon@webrtc.org Improve CPU utilization when encoding VP8 with a single temporal layer


Created with:
  gclient setdep -r src/third_party/webrtc@a34d7766c56a

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.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux_chromium_archive_rel_ng;luci.chromium.try:mac_chromium_archive_rel_ng

BUG=chromium:None
TBR=webrtc-chromium-sheriffs-robots@google.com

Change-Id: Ia708a6669e2a247e7ea9c2382d28f62268b8ba25
Reviewed-on: https://chromium-review.googlesource.com/c/1449787Reviewed-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@{#628416}

DEPS

@@ -1217,7 +1217,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'db52df17f0d012983dc281e4864c71485a86bd0e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'ab56670af9818d0a5bd628eb5c5dea6382f8de89',
+    Var('webrtc_git') + '/src.git' + '@' + 'a34d7766c56ae5e648c1db91edd380069f2300d6',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',