Fix bogus call to Object.hasOwnProperty in Array builtin.

src/array.js

 // Copyright 2012 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 633 matching lines @@
   var len = TO_UINT32(this.length);
   var num_arguments = %_ArgumentsLength();
   var is_sealed = ObjectIsSealed(this);
 
   if (%IsObserved(this))
     return ObservedArrayUnshift.apply(this, arguments);
 
   if (IS_ARRAY(this) && !is_sealed) {
     SmartMove(this, 0, 0, len, num_arguments);
   } else {
-    if (num_arguments == 0 && ObjectIsFrozen(this)) {
-      // In the zero argument case, values from the prototype come into the
-      // object. This can't be allowed on frozen arrays.
-      for (var i = 0; i < len; i++) {
-        if (!this.hasOwnProperty(i) && !IS_UNDEFINED(this[i])) {
-          throw MakeTypeError("array_functions_on_frozen",
-                              ["Array.prototype.shift"]);
-        }
-      }
-    }
-
     SimpleMove(this, 0, 0, len, num_arguments);
   }
 
   for (var i = 0; i < num_arguments; i++) {
     this[i] = %_Arguments(i);
   }
 
   var new_length = len + num_arguments;
   this.length = new_length;
   return new_length;
@@ skipping 957 matching lines @@
   ));
 
   SetUpLockedPrototype(InternalPackedArray, $Array(), $Array(
     "join", getFunction("join", ArrayJoin),
     "pop", getFunction("pop", ArrayPop),
     "push", getFunction("push", ArrayPush)
   ));
 }
 
 SetUpArray();