Write an automated test of the DefaultGeolocationSetting user policy, using the AutoTest+Telemetry Enterprise Policy Test framework. This policy is an enum ([1, 2, 3], or null), and has no dependent policies.

There are four possible policy values:
null - NotSet: "Allow user to configure"
1 - AllowGeolocation: "Allow sites to track the users' physical location"
2 - BlockGeolocation: Do not allow any site to track the users' physical location"
3 - AskGeolocation: Ask whenever a site wants to track the users' physical location"

This policy has the following bugs in Chrome OS:
- 155519: DefaultNotificationsSetting policy set to 3 (ask user) never allows notifications
- 155516: Content settings UI does not indicate that exceptions will be ignored when setting is managed by policy (equal to 1, 2, or 3). Exceptions are not ignored when policy is NotSet (=allow user to configure).