Roll WebRTC from d273ed0320fc to 19640aa61b04 (1 revision)

https://webrtc.googlesource.com/src.git/+log/d273ed0320fc..19640aa61b04

2020-10-20 mbonadei@webrtc.org Switch AppRTCMobile #import headers.

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: I2a261e1657396eddfeac1a10b3836b21143ce767
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487060
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#818877}

DEPS

@@ -1497,7 +1497,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'd273ed0320fcac7ffd6a083f4fb7871189e3446c',
+    Var('webrtc_git') + '/src.git' + '@' + '19640aa61b041a244755db66658c64918845f88e',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),