Roll src/third_party/webrtc 67b011d22c1b..68b2df7cf1e2 (3 commits)

https://webrtc.googlesource.com/src.git/+log/67b011d22c1b..68b2df7cf1e2


git log 67b011d22c1b..68b2df7cf1e2 --date=short --no-merges --format='%ad %ae %s'
2018-10-22 yinwa@webrtc.org Make protection_overhead_rate configurable through field trial.
2018-10-22 philipel@webrtc.org Don't decode frames with an older timestamp than the last decoded timestamp.
2018-10-22 alessiob@webrtc.org Revert "Remove deprecated barcode scanning functionality"


Created with:
  gclient setdep -r src/third_party/webrtc@68b2df7cf1e2

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: I5ef73e53f0982d4916cb3cda311895f20b4c7cdc
Reviewed-on: https://chromium-review.googlesource.com/c/1294216
Reviewed-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@{#601682}

DEPS

@@ -1156,7 +1156,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '6d2f3f4cb8bac1f7c4a945c73d07a33df74f22f9',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '67b011d22c1b343aedad667b387a6baa1cfcb796',
+    Var('webrtc_git') + '/src.git' + '@' + '68b2df7cf1e21897626a281a44ab3795c13aea05',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',