[debug-wrapper] migrate some scope related tests

test/debugger/debug/regress/regress-1639.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 var breaks = 0;
 var exception = false;
 
 function listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Break) {
       var line = event_data.sourceLineText();
       print('break: ' + line);
 
@@ skipping 28 matching lines @@
 function c() {
   a();
 }
 
 // Set a break point and call to invoke the debug event listener.
 Debug.setBreakPoint(b, 0, 0);
 a(b);
 a(); // BREAK 3
 
 assertFalse(exception);