Analogous to https://bugs.chromium.org/p/chromium/issues/detail?id=895340 but for datatype DEVICE_INFO.

Ideally, the core sync machinery should be agnostic of datatypes and shouldn't own any datatype implementation (bridge).

This also would avoid hacks and complexity to avoid circular dependencies across KeyedServices, since it's not uncommon for datatypes to have a dependency to information about the local device (LocalDeviceInfoProvider).