Computer Configuration > Administrative Templates > Google Chrome > Certificate management settings
Both
HKLM\Software\Policies\Google\Chrome
Setting the policy to All (0) or leaving it unset lets users edit trust settings for all CA certificates, remove user-imported certificates, and import certificates using Certificate Manager. Setting the policy to UserOnly (1) lets users manage only user-imported certificates, but not change trust settings of built-in certificates. Setting it to None (2) lets users view (not manage) CA certificates.