code: function (depMap) {
                  var mod = getOwn(registry, depMap.id);
                  if (mod) {
                      getModule(depMap).enable();
                  }
              }
docs: Called to enable a module if it is still in the registry
  awaiting enablement. A second arg, parent, the parent module,
  is passed in for context, when this method is overriden by
  the optimizer. Not shown here to keep code compact.