I use Chrome all the time. As a developer I am keenly aware of the issues and manage the risk. I will not allow anyone in my family to use Chrome because the potential security leak could have dire consequences.
Open Chrome
Go to Settings
Click on "Show Advanced Settings"
Click on "Managed Saved Passwords"
Click on a saved password
Click on "Show"
Write down or copy/paste/email the login in this fashion one-by-one.
If they are after a pile of logins, keep clicking "Show" all the way down the list. Capture the screen and email/print or simply take your smartphone and snap a picture.
Scroll through the entire login list to get it all.
Takes very little time to get all of someone's private login data in this fashion. An, since the vast majority of Internet users re-use login user id's and passwords across many services I would imagine it might not take long to identify this pattern and have access to every login.
Locking the workstation behind a password doesn't help either for a number of reasons, not the least of which is that workstation password removal, recovery or cracking tools are widely and easily available.
I've written about this before and so have countless of other techies. A non-techie has not a single clue, making them perfect victims. Any number of scenarios can be imagined: From taking your laptop in for repairs/upgrades to someone gaining physical access to your machine for just a few minutes. And, just like that, your digital life is turned upside-down.