Roll src/third_party/webrtc 01525f9e0338..7c6f74ab0344 (4 commits)

https://webrtc.googlesource.com/src.git/+log/01525f9e0338..7c6f74ab0344

git log 01525f9e0338..7c6f74ab0344 --date=short --no-merges --format='%ad %ae %s'
2019-08-13 qingsi@webrtc.org Set the usage pattern bits for adding remote ICE candidates from SDP.
2019-08-13 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 3ae2445b..6652dd41 (686310:686436)
2019-08-13 eladalon@webrtc.org Control PeerConnectionFactory's default min/starting/max bitrates from experiment
2019-08-13 nisse@webrtc.org Delete StreamDataCountersCallback from ReceiveStatistics

Created with:
  gclient setdep -r src/third_party/webrtc@7c6f74ab0344

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: Ica56c038235c210eed733d59b8a38cc2a5c9b171
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752906Reviewed-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@{#686631}

DEPS

@@ -1380,7 +1380,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'abaae129d9a0c6e1e092067e0b105475df43352e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '01525f9e03384601605ccaa5603481f1de860444',
+    Var('webrtc_git') + '/src.git' + '@' + '7c6f74ab0344e9c6201de711d54026e9990b8e6c',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',