component/chromium: run chrome with --no-sandbox

On some machines chrome refuses to start with
[6536:6536:1005/054746.213927:FATAL:zygote_host_impl_linux.cc(116)] No usable sandbox! Update your kernel or see https://chromium.googlesource.com/chromium/src/+/master/docs/linux_suid_sandbox_development.md for more information on developing with the SUID sandbox. If you want to live dangerously and need an immediate workaround, you can try using --no-sandbox.

This chrome is not intended to be used for more than running testsuites, so I
believe we can live without the extra security chrome sandbox would have
offered us.