[debug-wrapper] Further extend the debug wrapper

test/debugger/debug/es6/debug-promises/reject-in-constructor.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --expose-debug-as debug
 
 // Test debug events when we only listen to uncaught exceptions and
 // the Promise is rejected in the Promise constructor.
 // We expect an Exception debug event with a promise to be triggered.
 
 Debug = debug.Debug;
 
 var steps = 0;
 var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Exception) {
       steps++;
       assertEquals("uncaught", event_data.exception().message);
-      assertTrue(event_data.promise() instanceof Promise);
       assertTrue(event_data.uncaught());
       // Assert that the debug event is triggered at the throw site.
       assertTrue(exec_state.frame(0).sourceLineText().indexOf("// event") > 0);
     }
   } catch (e) {
     exception = e;
   }
 }
 
 Debug.setBreakOnUncaughtException();
 Debug.setListener(listener);
 
 var p = new Promise(function(resolve, reject) {
   reject(new Error("uncaught"));  // event
 });
 
 assertEquals(1, steps);
 assertNull(exception);