Roll src/third_party/webrtc 7dbb7c311f00..645a3afceae0 (2 commits)

https://webrtc.googlesource.com/src.git/+log/7dbb7c311f00..645a3afceae0


git log 7dbb7c311f00..645a3afceae0 --date=short --no-merges --format='%ad %ae %s'
2018-11-16 solenberg@webrtc.org Remove unused/unnecessary things from ChannelSend.
2018-11-16 nisse@webrtc.org Add default values for PlayoutDelay in RTPVideoHeader.


Created with:
  gclient setdep -r src/third_party/webrtc@645a3afceae0

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

Change-Id: I9184912693bd50867ad728f46ada7b5ec16f15c3
Reviewed-on: https://chromium-review.googlesource.com/c/1340380Reviewed-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@{#608833}

DEPS

@@ -1161,7 +1161,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '5b6cbd789b9b91b4e46dde883c9f2ecb31eddade',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '7dbb7c311f00584051630930990fe397c3026df9',
+    Var('webrtc_git') + '/src.git' + '@' + '645a3afceae0a88f1da9347bbee70c1a11a94ee4',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',