removing unused _bounds member variable. non-functinal change.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11215 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -239,7 +239,6 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
                     if (this.timerId != null) {
                         window.clearTimeout(this.timerId);
                     }
-                    this._bounds = bounds;
                     this.timerId = window.setTimeout(
                         this._moveGriddedTiles,
                         this.tileLoadingDelay
@@ -663,7 +662,6 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * Method: moveGriddedTiles
      */
     moveGriddedTiles: function() {
-        var bounds = this._bounds;
         var shifted = true;
         var buffer = this.buffer || 1;
         var tlLayer = this.grid[0][0].position;
@@ -678,7 +676,6 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
             this.shiftRow(false);
         } else {
             shifted = false;
-            delete this._bounds;
         }
         if (shifted) {
             // we may have other row or columns to shift, schedule it

tests/Layer/Grid.html

@@ -195,7 +195,7 @@
         };
         layer._moveGriddedTiles = function() {
             g_WhichFunc = "MoveGridded";
-            g_Bounds = layer._bounds;
+            g_Bounds = layer.map.getExtent();
         };
         var clearTestBounds = function() {
             g_WhichFunc = null;