Roll src/third_party/webrtc 206d46750780..40b764a6ba45 (3 commits)

https://webrtc.googlesource.com/src.git/+log/206d46750780..40b764a6ba45

git log 206d46750780..40b764a6ba45 --date=short --first-parent --format='%ad %ae %s'
2020-02-27 asapersson@webrtc.org VideoSendStreamTest: remove unused array and member.
2020-02-27 chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com Roll chromium_revision 95bde2f2..7c2b6c4e (744714:744850)
2020-02-26 trevor.axiom@gmail.com Reland "Reland "Reland "Reland "Reland "Implemented screen enumeration and selection for desktop capture under X11 using the X Resize and Rotate extension version 1.5."""""

Created with:
  gclient setdep -r src/third_party/webrtc@40b764a6ba45

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:396091
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: Iff8245234b29ba53d9aac093b00952408dbcba05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078071Reviewed-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@{#745015}

DEPS

@@ -1431,7 +1431,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + 'ec18cc3262922e7dcdbe70243c6f40606f979144',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '206d46750780467c78a233949b8b44d04e3ca0d5',
+    Var('webrtc_git') + '/src.git' + '@' + '40b764a6ba4593e300447a2ceb3bde6e8fd25bf8',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),