[debugger] Further stepping support in test wrapper

test/debugger/debug/debug-stepin-call-function-stub.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 = 0;
 var expected_function_name = null;
 var expected_source_line_text = null;
 var expected_caller_source_line = null;
 var step_in_count = 2;
 
 // Simple debug event handler which first time will cause 'step in' action
@@ skipping 41 matching lines @@
 }
 
 // Run three times. First time the function will be compiled lazily,
 // second time cached version will be used.
 for (var i = 0; i < 3; i++) {
   state = 0;
   expected_function_name = 'g';
   expected_source_line_text = '   return "s";  // expected line';
   step_in_count = 2;
   // Set a break point and call to invoke the debug event listener.
-  Debug.setBreakPoint(testFunction, 1, 0);
+  const breakid = Debug.setBreakPoint(testFunction, 1, 0);
   testFunction();
+  Debug.clearBreakPoint(breakid);
   assertNull(exception);
   assertEquals(3, state);
 }
 
 // Test stepping into function call when a breakpoint is set at the place
 // of call. Use different pair of functions so that g2 is compiled lazily.
 // Run twice: first time function will be compiled lazily, second time
 // cached version will be used.
 for (var i = 0; i < 3; i++) {
   state = 0;
   expected_function_name = 'g2';
   expected_source_line_text = '   return "s2";  // expected line';
   step_in_count = 1;
   // Set a break point and call to invoke the debug event listener.
-  Debug.setBreakPoint(testFunction2, 2, 0);
+  const breakid = Debug.setBreakPoint(testFunction2, 2, 0);
   testFunction2();
+  Debug.clearBreakPoint(breakid);
   assertNull(exception);
   assertEquals(3, state);
 }
 
 
 // Get rid of the debug event listener.
 Debug.setListener(null);