Roll WebRTC from ae1892d4e4ce to c6d6e06a5c45 (3 revisions)

https://webrtc.googlesource.com/src.git/+log/ae1892d4e4ce..c6d6e06a5c45

2020-06-18 nisse@webrtc.org Delete OpaqueTransportParameters and SDP attribute x-otp
2020-06-18 deadbeef@webrtc.org Disable SCTP asconf and auth extensions.
2020-06-17 mbonadei@webrtc.org Remove //tools_webrtc/sancov.

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: I428362d3fba349b961f4ee515c06c3f7d5beef04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251175Reviewed-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@{#779747}

DEPS

@@ -1452,7 +1452,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'ae1892d4e4ceac436191d0a33f99cdf337cc5c5f',
+    Var('webrtc_git') + '/src.git' + '@' + 'c6d6e06a5c45d1e4ce83b1fb8e401a422aee5e70',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),