Roll src/third_party/webrtc 61b15905b014..7cbee84610a8 (3 commits)

https://webrtc.googlesource.com/src.git/+log/61b15905b014..7cbee84610a8

git log 61b15905b014..7cbee84610a8 --date=short --no-merges --format='%ad %ae %s'
2019-08-06 srte@webrtc.org Reland "Adds PeerConnection scenario test framework."
2019-08-06 sprang@webrtc.org DegradedCall: fake network using TaskQueue instead of ProcessThread
2019-08-06 mbonadei@webrtc.org Disable RunPythonTests on rtc_tools.

Created with:
  gclient setdep -r src/third_party/webrtc@7cbee84610a8

The AutoRoll server is located here: https://autoroll.skia.org/r/webrtc-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TBR=webrtc-chromium-sheriffs-robots@google.com

Bug: chromium:None
Change-Id: I696d68c872e0622c9fc9cb635c5ac7d929b84639
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1738994Reviewed-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@{#684403}

DEPS

@@ -1375,7 +1375,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'abaae129d9a0c6e1e092067e0b105475df43352e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '61b15905b0145bf339fc785a1d8913a631dbac7b',
+    Var('webrtc_git') + '/src.git' + '@' + '7cbee84610a8d4f2bbc86c55d9ee02d25be19f72',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',