Revert "Roll third_party/openscreen dependency"

This reverts commit 097960fa.

Reason for revert: Breaks SyncChrome stage in Chrome OS
due to old depot_tools on Chrome OS builders:
https://crbug.com/963259, https://crbug.com/964720

Original change's description:
> Roll third_party/openscreen dependency
> 
> This patch rolls openscreen to the latest HEAD.
> 
> Change-Id: I9890293e3b2ed62a702bd0aa08a0615cf26798a2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618022
> Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
> Commit-Queue: Jordan Bayles <jophba@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#661020}

TBR=mfoltz@chromium.org,btolsch@chromium.org,pthatcher@chromium.org,jophba@chromium.org

Bug: chromium:963259, chromium:964720

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I2e31746dd66e0572f8002d9a9312ea2e4b1d63b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618593Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661208}

DEPS

@@ -1154,7 +1154,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/cisco/openh264' + '@' + '6f26bce0b1c4e8ce0e13332f7c0083788def5fdf',
 
   'src/third_party/openscreen/src':
-    Var('chromium_git') + '/openscreen' + '@' + '9ade415f62a7f5d2b4233a103488c5a5cf08fc45',
+    Var('chromium_git') + '/openscreen' + '@' + 'b1d095ba4f8f3ec1efd90dbd5cb0a37e5b4b21f7',
 
   'src/third_party/ow2_asm': {
       'packages': [