[debugger] Further stepping support in test wrapper

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

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-// Flags: --expose-debug-as debug
 
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 var exception = null;
 var state = 1;
 var expected_source_line_text = null;
 var expected_function_name = null;
 
 // Simple debug event handler which first time will cause 'step in' action
 // and than check that execution is paused inside function
 // expected_function_name.
@@ skipping 28 matching lines @@
   var s = Array.prototype.slice.call(a, 2,3);
 }  // expected line
 
 state = 1;
 testStepInArraySlice();
 assertNull(exception);
 assertEquals(4, state);
 
 // Get rid of the debug event listener.
 Debug.setListener(null);