chromium/third_party/blink/web_tests/third_party/gsubtest/LICENSE.txt

Test font file available under the following license terms:

"The person who associated a work with this deed has dedicated the work to the
public domain by waiving all of his or her rights to the work worldwide under
copyright law, including all related and neighboring rights, to the extent
allowed by law.

You can copy, modify, distribute and perform the work, even for commercial
purposes, all without asking permission. See Other Information below."

http://creativecommons.org/publicdomain/zero/1.0/

according to:

https://bugzilla.mozilla.org/show_bug.cgi?id=1261445