"Remove unused 'tileOrigin' code from TileCache layer", (Closes #1076). Though

the idea behind this is good, having the code here and unused is not the right
thing to do. (See #1302) for a better attempt at what this should actually be.
The reason this code exists is almost certainly a carggocult from Layer.TMS,
which *does* have a tileOrigin, and I'm pretty sure tschaub started by copying
from that. r=me, though it's mostly just docs. 


git-svn-id: http://svn.openlayers.org/trunk/openlayers@8930 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/TileCache.js

@@ -27,13 +27,6 @@ OpenLayers.Layer.TileCache = OpenLayers.Class(OpenLayers.Layer.Grid, {
      */
     isBaseLayer: true,
     
-    /**
-     * APIProperty: tileOrigin
-     * {<OpenLayers.LonLat>} Location of the tile lattice origin.  Default is
-     *     bottom left of the maxExtent.
-     */
-    tileOrigin: null,
-
     /** 
      * APIProperty: format
      * {String} Mime type of the images returned.  Default is image/png.
@@ -157,22 +150,6 @@ OpenLayers.Layer.TileCache = OpenLayers.Class(OpenLayers.Layer.Grid, {
         return new OpenLayers.Tile.Image(this, position, bounds, 
                                              url, this.tileSize);
     },
-
+    
-    /** 
-     * Method: setMap
-     * When the layer is added to a map, then we can fetch our origin 
-     *     (if we don't have one.) 
-     * 
-     * Parameters:
-     * map - {<OpenLayers.Map>} 
-     */
-    setMap: function(map) {
-        OpenLayers.Layer.Grid.prototype.setMap.apply(this, arguments);
-        if (!this.tileOrigin) { 
-            this.tileOrigin = new OpenLayers.LonLat(this.map.maxExtent.left,
-                                                    this.map.maxExtent.bottom);
-        }
-    },
-
     CLASS_NAME: "OpenLayers.Layer.TileCache"
 });