Fixed redundant tileSize definition.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@318 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -10,14 +10,12 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
     params: null,
 
     // tileSize: OpenLayers.Size
-    tileSize: null,
+    tileSize: new OpenLayers.Size(256,256),
 
     // grid: Array(Array())
     // this is an array of rows, each row is an array of tiles
     grid: null,
 
-    tileSize: new OpenLayers.Size(256,256),
-
     /**
     * @param {str} name
     * @param {str} url