Roll src/third_party/webrtc 59021ba4e1dc..cd18bf9522d4 (3 commits)

https://webrtc.googlesource.com/src.git/+log/59021ba4e1dc..cd18bf9522d4


git log 59021ba4e1dc..cd18bf9522d4 --date=short --no-merges --format='%ad %ae %s'
2018-10-03 mbonadei@webrtc.org Compile remote_bitrate_estimator without -Wno-exit-time-destructors.
2018-10-03 buildbot@webrtc.org Roll chromium_revision 14de2307..f33d9eb9 (596155:596278)
2018-10-03 danilchap@webrtc.org Move RtpHeaderExtensionMap::GetTotalLengthInBytes into own file


Created with:
  gclient setdep -r src/third_party/webrtc@cd18bf9522d4

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: I4bdfd696aaae2f9162b862571d815bfd670b7715
Reviewed-on: https://chromium-review.googlesource.com/c/1259498Reviewed-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@{#596387}

DEPS

@@ -1106,7 +1106,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '6d2f3f4cb8bac1f7c4a945c73d07a33df74f22f9',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '59021ba4e1dcd6b5dddf966591a4d0ebc6862705',
+    Var('webrtc_git') + '/src.git' + '@' + 'cd18bf9522d4eb632771a572ad716c8227598bff',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',