Roll src/third_party/webrtc 78cdde3df652..4bb1e4a1d50f (2 commits)

https://webrtc.googlesource.com/src.git/+log/78cdde3df652..4bb1e4a1d50f


git log 78cdde3df652..4bb1e4a1d50f --date=short --no-merges --format='%ad %ae %s'
2018-10-05 aleloi@webrtc.org Lower gain parameters for AGC2.
2018-10-05 sprang@webrtc.org Hide libvpx vp8 encoder behind an interface and add mock for testing.


Created with:
  gclient setdep -r src/third_party/webrtc@4bb1e4a1d50f

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:892043
TBR=webrtc-chromium-sheriffs-robots@google.com

Change-Id: I1c344b233a72919ef2cfa09d34ea7f3adb194e41
Reviewed-on: https://chromium-review.googlesource.com/c/1264619Reviewed-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@{#597088}

DEPS

@@ -1106,7 +1106,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '6d2f3f4cb8bac1f7c4a945c73d07a33df74f22f9',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '78cdde3df6525b39c6f7ec718117e7d1ad5870ba',
+    Var('webrtc_git') + '/src.git' + '@' + '4bb1e4a1d50fbae6043ca73a83117a18d81f755e',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',