Removed old code from attach_extend()

lib/class.js

@@ -78,6 +78,8 @@ exports.abstractMethod = function( definition )
 function Class() {};
 
 
+
+
 /**
  * Copies properties to the destination object
  *
@@ -445,13 +447,9 @@ function attach_extend( func )
      *
      * @return  {Object}  extended class
      */
-    var ext_method = function( props )
+    define_secure_prop( func, 'extend', function( props )
     {
         return extend( this, props );
-    };
-
-    // if defineProperty is unsupported, do it the old fashioned way (it's just
-    // less restrictive)
-    define_secure_prop( func, 'extend', ext_method );
+    });
 }