[debugger] Basic scope functionality and exception events in wrapper

test/debugger/debug/regress/regress-4309-1.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 --allow-natives-syntax
 
 var Debug = debug.Debug;
 
 var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
     var scopes = exec_state.frame().allScopes();
     assertEquals(3, scopes.length);
@@ skipping 12 matching lines @@
 
 f();
 f();
 
 %OptimizeFunctionOnNextCall(f);
 Debug.setListener(listener);
 
 f();
 
 assertNull(exception);