Roll src/third_party/webrtc 430e4a09e0ca..ed678386b4ac (3 commits)

https://webrtc.googlesource.com/src.git/+log/430e4a09e0ca..ed678386b4ac

git log 430e4a09e0ca..ed678386b4ac --date=short --first-parent --format='%ad %ae %s'
2020-03-11 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision ad5dd080..9a91e044 (748920:749020)
2020-03-10 kron@webrtc.org Add RTC_EXPORT to webrtc::Clock
2020-03-10 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 4fa1454b..ad5dd080 (748775:748920)

Created with:
  gclient setdep -r src/third_party/webrtc@ed678386b4ac

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: chromium:1011581
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: I077a473095a7acb3bd3687c33db7189cf1f078b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096711Reviewed-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@{#749048}

DEPS

@@ -1454,7 +1454,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + 'ec18cc3262922e7dcdbe70243c6f40606f979144',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '430e4a09e0ca66a9680cd9884a90ca5b4346bcd7',
+    Var('webrtc_git') + '/src.git' + '@' + 'ed678386b4ace885eecf7578c74663b641db5da2',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),