[debug-wrapper] migrate some scope related tests

test/debugger/debug/debug-backtrace.js

 // Copyright 2008 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 22 matching lines @@
 
 var m = (0, function() {
   new f(1);
 });
 
 function g() {
   m();
 };
 
 
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 listenerCalled = false;
 exception = false;
 
 function listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Break) {
       // The expected backtrace is
       // 0: f
@@ skipping 36 matching lines @@
 // Add the debug event listener.
 Debug.setListener(listener);
 
 // Set a break point and call to invoke the debug event listener.
 Debug.setBreakPoint(f, 0, 0);
 g();
 
 // Make sure that the debug event listener vas invoked.
 assertFalse(exception, "exception in listener");
 assertTrue(listenerCalled);