Computer Configuration > Administrative Templates > Google Chrome > Content settings
Both
HKLM\Software\Policies\Google\Chrome
Setting the policy to 3 lets websites ask for access to HID devices. Setting the policy to 2 denies access to HID devices. Leaving it unset lets websites ask for access, but users can change this setting. This policy can be overridden for specific url patterns using the WebHidAskForUrls and WebHidBlockedForUrls policies.