Roll src/third_party/webrtc 273e263d25b4..e4ba4ee837ac (4 commits)

https://webrtc.googlesource.com/src.git/+log/273e263d25b4..e4ba4ee837ac

git log 273e263d25b4..e4ba4ee837ac --date=short --no-merges --format='%ad %ae %s'
2019-08-09 nisse@webrtc.org Delete placeholder file rtc_base/function_view.h
2019-08-09 nisse@webrtc.org Use StreamStatistician::BitrateReceived to produce total_bitrate_bps for GetStats.
2019-08-09 nisse@webrtc.org Delete rtc_base/gunit_prod.h
2019-08-09 nisse@webrtc.org Add missing AppKit dependency

Created with:
  gclient setdep -r src/third_party/webrtc@e4ba4ee837ac

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,chromium:None,chromium:None
Change-Id: I9f5c151715a1b5b6dc3e003d6aa65d7323056fe9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1746291Reviewed-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@{#685527}

DEPS

@@ -1380,7 +1380,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'abaae129d9a0c6e1e092067e0b105475df43352e',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '273e263d25b4ba2533c7f059dbf5ccd141dd0f7a',
+    Var('webrtc_git') + '/src.git' + '@' + 'e4ba4ee837acb8dfc2045a1c63a39547da419d7e',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',