Roll src/third_party/webrtc 02b17a5507ae..703a5d76d9ba (3 commits)

https://webrtc.googlesource.com/src.git/+log/02b17a5507ae..703a5d76d9ba

git log 02b17a5507ae..703a5d76d9ba --date=short --first-parent --format='%ad %ae %s'
2020-02-05 trevor.axiom@gmail.com Reland "Reland "Reland "Implemented screen enumeration and selection for desktop capture under X11 using the X Resize and Rotate extension version 1.5."""
2020-02-05 hta@webrtc.org Cleanup: remove unused sctp_content_name
2020-02-05 ilnik@webrtc.org Make RtpEncodingParameters to not reverse active flags order

Created with:
  gclient setdep -r src/third_party/webrtc@703a5d76d9ba

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: Iea7da4ca7d1972ac01b8df38e70ea068da0dfc4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040043Reviewed-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@{#738733}

DEPS

@@ -1463,7 +1463,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/gpuweb/cts.git' + '@' + 'ec18cc3262922e7dcdbe70243c6f40606f979144',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + '02b17a5507ae6be7cb8775760627b79b7faba69c',
+    Var('webrtc_git') + '/src.git' + '@' + '703a5d76d9ba8e7984509cc7bf70fb4ed84ef6be',
 
   'src/third_party/libgifcodec':
      Var('skia_git') + '/libgifcodec' + '@'+  Var('libgifcodec_revision'),