Roll src/third_party/webrtc 1beef1a97aa7..4e5af96606b9 (6 commits)

https://webrtc.googlesource.com/src.git/+log/1beef1a97aa7..4e5af96606b9


git log 1beef1a97aa7..4e5af96606b9 --date=short --no-merges --format='%ad %ae %s'
2018-09-03 andersc@webrtc.org Include i420 buffers in Obj-C framework again.
2018-09-03 srte@webrtc.org Adds % unit to float field trial parser.
2018-09-03 aleloi@webrtc.org Echo metric support for the APM-QA.
2018-09-03 brandtr@webrtc.org Add field trial for disabling FrameDropper.
2018-09-03 brandtr@webrtc.org Remove unused MockFrameDropper and make FrameDropper non-virtual.
2018-09-03 ilnik@webrtc.org Remove obsolete field trial from the tests


Created with:
  gclient setdep -r src/third_party/webrtc@4e5af96606b9

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
TBR=webrtc-chromium-sheriffs-robots@google.com

Change-Id: I53ea1b1924bdad6eff923eb4036052bacd4941ef
Reviewed-on: https://chromium-review.googlesource.com/1202506Reviewed-by: webrtc-chromium-autoroll <webrtc-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: webrtc-chromium-autoroll <webrtc-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#588417}

DEPS

@@ -1098,7 +1098,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '7ca87fb1d3da3b3d2060886e8c58e726d74c8219',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '1beef1a97aa7e9a3f50776e100fa2bc7c63fcdd8',
+    Var('webrtc_git') + '/src.git' + '@' + '4e5af96606b94b048132cbf61514fa2b12cb0edc',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',