Revert "Roll src/third_party/webrtc/ 202be3957..ed1023db0 (19 commits)"

This reverts commit a2ec7611.

Reason for revert: This roll still does not include the fix for the build error on "chromium.win/WinMSVC64 (dbg)".
This had to be manually adjusted to the last working commit.

Original change's description:
> Roll src/third_party/webrtc/ 202be3957..ed1023db0 (19 commits)
>
> https://webrtc.googlesource.com/src.git/+log/202be3957d95..ed1023db0eb8
>
> $ git log 202be3957..ed1023db0 --date=short --no-merges --format='%ad %ae %s'
>
> Created with:
>   roll-dep src/third_party/webrtc
> BUG=None
>
>
> The AutoRoll server is located here: https://webrtc-chromium-roll.skia.org
>
> Documentation for the AutoRoller is here:
> https://skia.googlesource.com/buildbot/+/master/autoroll/README.md
>
> If the roll is causing failures, please contact the current sheriff, who should
> be CC'd on the roll, and stop the roller if necessary.
>
>
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_archive_rel_ng;master.tryserver.chromium.mac:mac_chromium_archive_rel_ng
> TBR=webrtc-chromium-sheriffs-robots@google.com
>
> Change-Id: I660131e50f90463ee04ddd62292b7858525a8b03
> Reviewed-on: https://chromium-review.googlesource.com/781366
> Reviewed-by: WebRTC Roll Bot <webrtc-autoroll@chromium.org>
> Commit-Queue: WebRTC Roll Bot <webrtc-autoroll@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#518294}

TBR=webrtc-autoroll@chromium.org,webrtc-chromium-sheriffs-robots@google.com

Change-Id: I79ff7c5d777a62975b20ed5678f982b4e7f7d4ce
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 787192
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_archive_rel_ng;master.tryserver.chromium.mac:mac_chromium_archive_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/783850
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518435}

DEPS

@@ -624,7 +624,7 @@ deps = {
     Var('chromium_git') + '/external/khronosgroup/webgl.git' + '@' + 'e4919fa03c74bd561dcabf3e61668fa3c7e54353',
 
   'src/third_party/webrtc':
-    Var('webrtc_git') + '/src.git' + '@' + 'ed1023db0eb81f7fd27e487eba2a811db99a6e80', # commit position 20628
+    Var('webrtc_git') + '/src.git' + '@' + '2707fb2782e7a47d0f53cf8e561bef0bc00fad66', # commit position 20628
 
   'src/third_party/xdg-utils': {
       'url': Var('chromium_git') + '/chromium/deps/xdg-utils.git' + '@' + 'd80274d5869b17b8c9067a1022e4416ee7ed5e0d',