Debian: DSA-4395-2 Update Fixes Chromium Headless Crash

A regression was introduced in the previous chromium security update. The
browser would always crash when launched in headless mode. This update fixes
this problem.

A file conflict with the buster chromium packages is also fixed.

For the stable distribution (stretch), this problem has been fixed in
version 72.0.3626.96-1~deb9u2.

We recommend that you upgrade your chromium packages.

For the detailed security status of chromium please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/chromium

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/