Roll src/third_party/webrtc 6b3d18164b4a..59cfd3543875 (3 commits)

https://webrtc.googlesource.com/src.git/+log/6b3d18164b4a..59cfd3543875


git log 6b3d18164b4a..59cfd3543875 --date=short --no-merges --format='%ad %ae %s'
2018-11-27 yvesg@webrtc.org Address vptr race condition while PeerConnection is destructed.
2018-11-27 kron@webrtc.org Change HdrMetadataExtension to ColorSpaceExtension
2018-11-27 nisse@webrtc.org Move RtcpStatistics from common_types.h to a new header file


Created with:
  gclient setdep -r src/third_party/webrtc@59cfd3543875

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: Iae8475100a6a4a4a30dc7443c2ca214f49602f1b
Reviewed-on: https://chromium-review.googlesource.com/c/1352245Reviewed-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@{#611447}

DEPS

@@ -1171,7 +1171,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '5b6cbd789b9b91b4e46dde883c9f2ecb31eddade',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '6b3d18164b4ac2eb954663d162644a12eeb13ea6',
+    Var('webrtc_git') + '/src.git' + '@' + '59cfd35438753acd69859e8a2f98f6490e68d6a0',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',