Roll src/third_party/webrtc 43245c56b086..4a5bce96e8c2 (2 commits)

https://webrtc.googlesource.com/src.git/+log/43245c56b086..4a5bce96e8c2

git log 43245c56b086..4a5bce96e8c2 --date=short --first-parent --format='%ad %ae %s'
2020-04-15 brandtr@webrtc.org Change to more idiomatic map erase.
2020-04-15 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 72d0f390..a775f4ae (758913:759199)

Created with:
  gclient setdep -r src/third_party/webrtc@4a5bce96e8c2

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/+/master/autoroll/README.md

Bug: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I49861aefbbeae3a273a6212f0028ae6e922fa538
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2150607Reviewed-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@{#759263}

DEPS

@@ -1460,7 +1460,7 @@ deps = {
   },
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '43245c56b086f85dedec46fd61dcbaf14eaebe14',
+    Var('webrtc_git') + '/src.git' + '@' + '4a5bce96e8c21a9b5e626f5e33d329a5555332f7',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),