Roll src/third_party/webrtc 9acf1c1f5497..c98849cf92c3 (4 commits)

https://webrtc.googlesource.com/src.git/+log/9acf1c1f5497..c98849cf92c3


git log 9acf1c1f5497..c98849cf92c3 --date=short --no-merges --format='%ad %ae %s'
2018-10-22 devicentepena@webrtc.org AEC3: changes the signal used for deciding when to update the erle so the reverb render signal is now used
2018-10-22 srte@webrtc.org Routing unacknowledged data in TransportFeedbackAdapter.
2018-10-22 kwiberg@webrtc.org Audio codecs API: Remove some weasel words in the docs
2018-10-22 nisse@webrtc.org Delete dead code in webrtc_libyuv.cc


Created with:
  gclient setdep -r src/third_party/webrtc@c98849cf92c3

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: I12ca21c2e17dbc6ccd1cbfb92eb4bd291cf654fa
Reviewed-on: https://chromium-review.googlesource.com/c/1293469
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@{#601552}