Function maybe_cross_origin_get_prototype 

pub fn maybe_cross_origin_get_prototype<D: DomTypes>(
    cx: &mut CurrentRealm<'_>,
    proxy: HandleObject<'_>,
    get_proto_object: fn(cx: &mut JSContext, global: HandleObject<'_>, rval: MutableHandleObject<'_>),
    proto: MutableHandleObject<'_>,
) -> bool

Implementation of [[GetPrototypeOf]] for Location.