include option --allow-downgrades to install chrome with older versions

[cesarsturion]

Checklist

• [ ] All new jobs, commands, executors, parameters have descriptions
• [ ] Examples have been added for any significant new features
• [ ] README has been updated, if necessary

Motivation, issues

Description

[ryanbourdais]

Hi @cesarsturion can you remove the changes made in your second commit to this PR?