Merge pull request #4756 from adube/fix-vector-tile-override

Remove VectorTile getSource re-definition of return value

src/ol/layer/vectortilelayer.js

@@ -53,15 +53,6 @@ ol.layer.VectorTile.prototype.getPreload = function() {
 };
 
 
-/**
- * Return the associated {@link ol.source.VectorTile source} of the layer.
- * @function
- * @return {ol.source.VectorTile} Source.
- * @api
- */
-ol.layer.VectorTile.prototype.getSource;
-
-
 /**
  * Whether we use interim tiles on error.
  * @return {boolean} Use interim tiles on error.