[debug-wrapper] Further extend the debug wrapper

test/debugger/debug/es6/default-parameters-debug.js

 // Copyright 2015 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
 
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 listenerComplete = false;
 breakPointCount = 0;
 exception = null;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
     breakPointCount++;
@@ skipping 27 matching lines @@
            c = (function() { debugger; })()) {
   var d = 'local';
   debugger;
 };
 
 f();
 
 // Make sure that the debug event listener vas invoked.
 assertEquals(3, breakPointCount);
 assertNull(exception);