Fix Object.getOwnPropertyDescriptor in string elements.

test/mjsunit/get-own-property-descriptor.js

 // Copyright 2010 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 55 matching lines @@
 var descObjectElement = Object.getOwnPropertyDescriptor(obj, '1');
 assertTrue(descObjectElement.enumerable);
 assertTrue(descObjectElement.configurable);
 assertTrue(descObjectElement.writable);
 assertEquals(descObjectElement.value, 42);
 
 // String objects.
 var a = new String('foobar');
 for (var i = 0; i < a.length; i++) {
   var descStringObject = Object.getOwnPropertyDescriptor(a, i);
-  assertFalse(descStringObject.enumerable);
+  assertTrue(descStringObject.enumerable);
   assertFalse(descStringObject.configurable);
   assertFalse(descStringObject.writable);
   assertEquals(descStringObject.value, a.substring(i, i+1));
 }
 
 // Support for additional attributes on string objects.
 a.x = 42;
 a[10] = 'foo';
 var descStringProperty = Object.getOwnPropertyDescriptor(a, 'x');
 assertTrue(descStringProperty.enumerable);
@@ skipping 25 matching lines @@
 function el_getter() { return 239; };
 function el_setter() {};
 Object.defineProperty(global, '239', {get: el_getter, set: el_setter});
 
 var descRegularElement = Object.getOwnPropertyDescriptor(global, '42');
 assertEquals(42, descRegularElement.value);
 
 var descAccessorElement = Object.getOwnPropertyDescriptor(global, '239');
 assertEquals(el_getter, descAccessorElement.get);
 assertEquals(el_setter, descAccessorElement.set);