How to use infoWindow.setFixedAnchor

In the older versions of the ArcGIS JavaScript API, you could specify the position of the infoWindow using map.infoWindow.setFixedAnchor(esri.dijit.InfoWindow.ANCHOR_UPPERRIGHT);

In version 3.11 this fails with TypeError: esri.dijit.InfoWindow is undefined

The help file for version 3.11 now says that setFixedAnchor is a string, so I tried map.infoWindow.setFixedAnchor("ANCHOR_UPPERRIGHT"); but this returns TypeError: map.infoWindow.setFixedAnchor is not a function

What is the correct syntax for using setFixedAnchor with an infoWindow in version 3.11 and above?

map.on("load", function(){
  map.infoWindow.resize(250,100); //this works
  map.infoWindow.setFixedAnchor("ANCHOR_UPPERRIGHT"); //this fails
});