Roll src/third_party/webrtc 2547d2cf2b12..b9bb3718e3bf (3 commits)

https://webrtc.googlesource.com/src.git/+log/2547d2cf2b12..b9bb3718e3bf


git log 2547d2cf2b12..b9bb3718e3bf --date=short --no-merges --format='%ad %ae %s'
2019-03-27 hta@webrtc.org Revert "Don't crash when a datachannel can't get an ID"
2019-03-26 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision ff1de589..69e6e3c1 (644450:644573)
2019-03-26 hta@webrtc.org Don't crash when a datachannel can't get an ID


Created with:
  gclient setdep -r src/third_party/webrtc@b9bb3718e3bf

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.



BUG=chromium:945256,chromium:None,chromium:945256
TBR=webrtc-chromium-sheriffs-robots@google.com

Change-Id: I97709821ca661ced6f75587984fd5aaf5892c4fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1540743Reviewed-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@{#644721}

DEPS

@@ -1343,7 +1343,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'a0f51b2e123f39c9ff12e621b0b47dd28dd64424',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '2547d2cf2b12514151e9a21463ccce1574556f5a',
+    Var('webrtc_git') + '/src.git' + '@' + 'b9bb3718e3bfb832b828ca07b954c24d44020ad3',
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',