remove event type list from Events (lazy listener initialization) p=tschaub,me r=erilem (closes #2555)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12384 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Tile.js

@@ -26,10 +26,12 @@
 OpenLayers.Tile = OpenLayers.Class({
     
     /** 
-     * Constant: EVENT_TYPES
-     * {Array(String)} Supported application event types
+     * Supported event types:
+     *  - *loadstart* Triggered when tile loading starts.
+     *  - *loadend* Triggered when tile loading ends.
+     *  - *reload* Triggered when an already loading tile is reloaded.
+     *  - *unload* Triggered before a tile is unloaded.
      */
-    EVENT_TYPES: [ "loadstart", "loadend", "reload", "unload"],
     
     /**
      * APIProperty: events
@@ -110,7 +112,7 @@ OpenLayers.Tile = OpenLayers.Class({
         //give the tile a unique id based on its BBOX.
         this.id = OpenLayers.Util.createUniqueID("Tile_");
         
-        this.events = new OpenLayers.Events(this, null, this.EVENT_TYPES);
+        this.events = new OpenLayers.Events(this);
 
         OpenLayers.Util.extend(this, options);
     },