Remove unused ol.pointer.EventSource#getMapping function

src/ol/pointer/eventsource.js

@@ -31,17 +31,6 @@ ol.pointer.EventSource.prototype.getEvents = function() {
 };
 
 
-/**
- * Returns a mapping between the supported event types and
- * the handlers that should handle an event.
- * @return {Object.<string, function(Event)>}
- *         Event/Handler mapping
- */
-ol.pointer.EventSource.prototype.getMapping = function() {
-  return this.mapping_;
-};
-
-
 /**
  * Returns the handler that should handle a given event type.
  * @param {string} eventType The event type.