Remove call to deprecated events.addEventType function

lib/OpenLayers/Layer/Grid.js

@@ -138,6 +138,26 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      */
     backBufferLonLat: null,
 
+    /**
+     * Register a listener for a particular event with the following syntax:
+     * (code)
+     * layer.events.register(type, obj, listener);
+     * (end)
+     *
+     * Listeners will be called with a reference to an event object.  The
+     *     properties of this event depends on exactly what happened.
+     *
+     * All event objects have at least the following properties:
+     * object - {Object} A reference to layer.events.object.
+     * element - {DOMElement} A reference to layer.events.element.
+     *
+     * Supported event types:
+     * tileloaded - Triggered when each new tile is
+     *     loaded, as a means of progress update to listeners.
+     *     listeners can access 'numLoadingTiles' if they wish to keep
+     *     track of the loading progress.
+     */
+
     /**
      * Constructor: OpenLayers.Layer.Grid
      * Create a new grid layer
@@ -151,14 +171,6 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
     initialize: function(name, url, params, options) {
         OpenLayers.Layer.HTTPRequest.prototype.initialize.apply(this, 
                                                                 arguments);
-        
-        //grid layers will trigger 'tileloaded' when each new tile is 
-        // loaded, as a means of progress update to listeners.
-        // listeners can access 'numLoadingTiles' if they wish to keep track
-        // of the loading progress
-        //
-        this.events.addEventType("tileloaded");
-
         this.grid = [];
 
         this._moveGriddedTiles = OpenLayers.Function.bind(