Roll src/third_party/webrtc 52ccb5e5b6e7..6ca908f48c88 (2 commits)

https://webrtc.googlesource.com/src.git/+log/52ccb5e5b6e7..6ca908f48c88

git log 52ccb5e5b6e7..6ca908f48c88 --date=short --first-parent --format='%ad %ae %s'
2020-01-16 phoglund@webrtc.org Shorten the fir filter adapt test quite a bit.
2020-01-16 danilchap@webrtc.org Delete RtpDepacketizer interface as no longer used

Created with:
  gclient setdep -r src/third_party/webrtc@6ca908f48c88

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/+/master/autoroll/README.md

Bug: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I36531911651bec5c6f5a964d53e36d0b44733a62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004495Reviewed-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@{#732358}

DEPS

@@ -1498,7 +1498,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + '4f3976e9b368ccfe7b9dd02014351936296dc72c',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '52ccb5e5b6e720d83269259be696797c55a7c642',
+    Var('webrtc_git') + '/src.git' + '@' + '6ca908f48c88fda174516ec8edc5041f61a432b2',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),