Merge pull request #103 from fredj/unused-var

Remove unused variable. r=elemoine

lib/OpenLayers/Layer/Grid.js

@@ -741,8 +741,6 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
         var tilelon = tileLayout.tilelon;
         var tilelat = tileLayout.tilelat;
 
-        this.origin = new OpenLayers.Pixel(tileoffsetx, tileoffsety);
-
         var startX = tileoffsetx; 
         var startLon = tileoffsetlon;