Following below step will help you to .
Log in to the Chromebook.
Go to Menu.
Locate the Administration Menu.
In the submenu, find Firewall.
If prompted, provide the root password.
Go to Allowed Services and grant Chrome access.
In the Firewall Configuration Summary, click Finish
I hope the above step will help to fix google chrome antivirus settings. If it doesn't work then you can also visit us on the blog for more detailed information.