Remove 'type' and 'arguments' properties from Error object.

test/mjsunit/regress/regress-1980.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 16 matching lines @@
 
 // See: http://code.google.com/p/v8/issues/detail?id=1980
 
 var invalid_this = [ "invalid", 23, undefined, null ];
 for (var i = 0; i < invalid_this.length; i++) {
   var exception = false;
   try {
     Error.prototype.toString.call(invalid_this[i]);
   } catch (e) {
     exception = true;
-    assertTrue("called_on_non_object" == e.type);
+    assertEquals("Error.prototype.toString called on non-object", e.message);
   }
   assertTrue(exception);
 }