Computer Configuration > Administrative Templates > Google Chrome > Legacy Browser Support
Both
HKLM\Software\Policies\Google\Chrome
Setting the policy controls the list of websites that will never cause a browser switch. Each item is treated as a rule. Those rules that match won't open an alternative browser. Unlike the BrowserSwitcherUrlList policy, rules apply to both directions. When the Internet Explorer® add-in is on, it also controls whether Internet Explorer® should open these URLs in Google Chrome. Leaving the policy unset adds no websites to the list. Note: Elements can also be added to this list through the BrowserSwitcherExternalGreylistUrl policy. Example value: ie.com !open-in-chrome.ie.com foobar.com/ie-only/