Computer Configuration > Administrative Templates > Google Chrome
Both
HKLM\Software\Policies\Google\Chrome
Controls whether users may use Chrome for Testing. If this policy is set to Enabled or not set, users may install and run Chrome for Testing. If this policy is set to Disabled, users are not allowed to run Chrome for Testing. Users will still be able to install Chrome for Testing, however it will not run with the profiles where this policy is set to Disabled.