Roll WebRTC from 3e98280633a4 to aef8a21a695c (4 revisions)

https://webrtc.googlesource.com/src.git/+log/3e98280633a4..aef8a21a695c

2020-09-17 mbonadei@webrtc.org Reland "Switch from rtc_ios_xctest_test to rtc_test".
2020-09-17 mbonadei@webrtc.org Add possibility to override mac_toolchain via .gclient custom_vars.
2020-09-17 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 3f2f2ac..9d25386 (807625:807774)
2020-09-16 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision a6c88d8..3f2f2ac (807489:807625)

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/master/autoroll/README.md

Bug: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I6f27d2079dc1d416228cc0c8b7ba95300aa80d26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416117
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@{#807878}

DEPS

@@ -1471,7 +1471,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '3e98280633a4ce45c71602d5ee5112f0d067b44d',
+    Var('webrtc_git') + '/src.git' + '@' + 'aef8a21a695c099faea26a5748f45b2d136258bc',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),