Convert all classes to use new-style class definitions. All tests pass.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1651 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Ajax.js

@@ -179,7 +179,7 @@ OpenLayers.Ajax.Request = OpenLayers.Class.create();
 OpenLayers.Ajax.Request.Events =
   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
 
-OpenLayers.Ajax.Request.prototype = OpenLayers.Util.extend(new OpenLayers.Ajax.Base(), {
+OpenLayers.Ajax.Request.prototype = OpenLayers.Class.inherit( OpenLayers.Ajax.Base, {
   initialize: function(url, options) {
     this.transport = OpenLayers.Ajax.getTransport();
     this.setOptions(options);