Fix ObjectNotifierPerformChange leak after r21126

test/cctest/test-object-observe.cc

 // 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 674 matching lines @@
 }
 
 
 TEST(DontLeakContextOnNotifierPerformChange) {
   HandleScope scope(CcTest::isolate());
   Handle<Value> foo = String::NewFromUtf8(CcTest::isolate(), "foo");
   LocalContext context(CcTest::isolate());
   context->SetSecurityToken(foo);
   CompileRun("var obj = {};");
   Handle<Value> object = CompileRun("obj");
+  Handle<Value> notifier = CompileRun("Object.getNotifier(obj)");
   {
     HandleScope scope(CcTest::isolate());
     LocalContext context2(CcTest::isolate());
     context2->SetSecurityToken(foo);
     context2->Global()->Set(String::NewFromUtf8(CcTest::isolate(), "obj"),
                             object);
-    CompileRun("var n = Object.getNotifier(obj);"
-               "n.performChange('foo', function() {});");
+    context2->Global()->Set(String::NewFromUtf8(CcTest::isolate(), "notifier"),
+                            notifier);
+    CompileRun("var obj2 = {};"
+               "var notifier2 = Object.getNotifier(obj2);"
+               "notifier2.performChange.call("
+                   "notifier, 'foo', function(){})");
   }
 
   v8::V8::ContextDisposedNotification();
   CheckSurvivingGlobalObjectsCount(1);
 }