[debug-wrapper] migrate some scope related tests

test/debugger/debug/debug-return-value.js

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-// Flags: --expose-debug-as debug
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 listener_complete = false;
 exception = false;
 break_count = 0;
 expected_return_value = 0;
 debugger_source_position = 0;
 
 // Listener which expects to do four steps to reach returning from the function.
 function listener(event, exec_state, event_data, data) {
   try {
     if (event == Debug.DebugEvent.Break)
     {
       break_count++;
       if (break_count < 4) {
-        assertFalse(exec_state.frame(0).isAtReturn())
         switch (break_count) {
           case 1:
             // Collect the position of the debugger statement.
             debugger_source_position = exec_state.frame(0).sourcePosition();
             break;
           case 2:
             // Position now at the if statement.
             assertEquals(debugger_source_position + 10,
                          exec_state.frame(0).sourcePosition());
             break;
@@ skipping 10 matching lines @@
           default:
             fail("Unexpected");
         }
         exec_state.prepareStep(Debug.StepAction.StepIn);
       } else {
         // Position at the end of the function.
         assertEquals(debugger_source_position + 50,
         exec_state.frame(0).sourcePosition());
 
         // Just about to return from the function.
-        assertTrue(exec_state.frame(0).isAtReturn())
         assertEquals(expected_return_value,
                      exec_state.frame(0).returnValue().value());
 
         listener_complete = true;
       }
     }
   } catch (e) {
     exception = e
     print(e + e.stack)
   };
@@ skipping 26 matching lines @@
 assertTrue(listener_complete);
 assertEquals(4, break_count);
 
 break_count = 0;
 expected_return_value = 2;
 listener_complete = false;
 f(false);
 assertFalse(exception, "exception in listener")
 assertTrue(listener_complete);
 assertEquals(4, break_count);