Roll WebRTC from 517f81e0a410 to 60ed45996279 (3 revisions)

https://webrtc.googlesource.com/src.git/+log/517f81e0a410..60ed45996279

2020-07-09 handellm@webrtc.org Migrate a leftover in test/ to webrtc::Mutex.
2020-07-09 eshr@google.com [Adaptation] Move AdaptationConstraints to VideoStreamAdapter
2020-07-09 handellm@webrtc.org Reland "Migrate test/time_controller to webrtc::Mutex."

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: I93b3ba7950ad0b0684ac67843bbba54fd67a325e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2289907Reviewed-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@{#786843}

DEPS

@@ -1469,7 +1469,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '517f81e0a410d47dbf3a887ec118e517c81ffa39',
+    Var('webrtc_git') + '/src.git' + '@' + '60ed45996279a352133299647dff1b4cdd77925b',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),