Computer Configuration > Administrative Templates > Google Chrome > Legacy Browser Support
Both
HKLM\Software\Policies\Google\Chrome
Setting the policy controls the list of websites to open in an alternative browser. Each item is treated as a rule for something to open in an alternative browser. Google Chrome uses those rules when choosing if a URL should open in an alternative browser. When the Internet Explorer® add-in is on, Internet Explorer® switches back to Google Chrome when the rules don't match. If rules contradict each other, Google Chrome uses the most specific rule. Leaving the policy unset adds no websites to the list. Note: Elements can also be added to this list through the BrowserSwitcherUseIeSitelist and BrowserSwitcherExternalSitelistUrl policies. Example value: ie.com !open-in-chrome.ie.com foobar.com/ie-only/