Roll src/third_party/webrtc e7c4f9065168..bd710dbacd8f (2 commits)

https://webrtc.googlesource.com/src.git/+log/e7c4f9065168..bd710dbacd8f

git log e7c4f9065168..bd710dbacd8f --date=short --first-parent --format='%ad %ae %s'
2020-02-14 xalep@google.com Removing dead code
2020-02-14 jakobi@webrtc.org Update transport overhead the first time the network connects.

Created with:
  gclient setdep -r src/third_party/webrtc@bd710dbacd8f

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: I8ebc810bd6557daf196d997ee59cbd96920ac91d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056988Reviewed-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@{#741436}

DEPS

@@ -1438,7 +1438,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + 'ec18cc3262922e7dcdbe70243c6f40606f979144',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'e7c4f906516813252c8fbbff450b771bd6c14e1c',
+    Var('webrtc_git') + '/src.git' + '@' + 'bd710dbacd8f590ef1c2e73a7b4c4602284ef296',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),