Roll WebRTC from 49c9b4ec3748 to 18c0cc2bbdce (1 revision)

https://webrtc.googlesource.com/src.git/+log/49c9b4ec3748..18c0cc2bbdce

2021-08-03 sprang@webrtc.org Refactor PacketSequencer in preparation for deferred sequencing.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/webrtc-chromium-autoroll
Please CC webrtc-chromium-sheriffs-robots@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Bug: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I19f47be66fa13ae85639fdb8e397257b260446da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3069708
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#908231}

DEPS

@@ -1621,7 +1621,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + '26da66e2987afd8fb426c8b83f7b96d500c3fb01',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '49c9b4ec3748a7f8e37865f44a89c1be8ed6dd8c',
+    Var('webrtc_git') + '/src.git' + '@' + '18c0cc2bbdce1bc18a73834227ef96bdb36a57b1',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),