Edit out toJSON() prototypes since they're breaking unit tests.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@991 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Ajax.js

@@ -201,13 +201,14 @@ OpenLayers.addScript = function(url) {
             }
         };
 
-    Object.prototype.toJSONString = function () {
+/*    Object.prototype.toJSONString = function () {
         return s.object(this);
     };
 
     Array.prototype.toJSONString = function () {
         return s.array(this);
     };
+*/
 })();
 
 String.prototype.parseJSON = function () {