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}
1 file changed