[debugger] Further stepping support in test wrapper

test/debugger/debug/debug-stepin-constructor.js

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-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 // Simple debug event handler which counts the number of breaks hit and steps.
 var break_break_point_hit_count = 0;
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.Break) {
     break_break_point_hit_count++;
     // Continue stepping until returned to bottom frame.
     if (exec_state.frameCount() > 1) {
       exec_state.prepareStep(Debug.StepAction.StepIn);
     }
-
-    // Test that there is a script.
-    assertTrue(typeof(event_data.func().script()) == 'object');
   }
 };
 
 // Add the debug event listener.
 Debug.setListener(listener);
 
 // Test step into constructor with simple constructor.
 function X() {
 }
 
@@ skipping 15 matching lines @@
   debugger;
   new Date();
 };
 
 break_break_point_hit_count = 0;
 g();
 assertEquals(4, break_break_point_hit_count);
 
 // Get rid of the debug event listener.
 Debug.setListener(null);