Chrome Version: 72.0.3609.0
OS: CrOS 11256.0.0-18.11.12

Switching language from en-US causes en-US to include "POSIX" in its name: "English (United States, POSIX)"

What steps will reproduce the problem?
(1) At OOBE, change the language to Spanish

Expected: ingles (Estados Unidos) is in list
Actual: ingles (Estados Unidos, POSIX) is in list

(2) Change back to English using "ingles (Estados Unidos, POSIX)"

Expected: Language shows as "English (United States)"
Actual: Language shows as "English (United States, POSIX)"