Removed `rl.on('close', ...)` callback

lib/_debugger.js

@@ -754,12 +754,7 @@ function Interface(stdin, stdout, args) {
   this.repl = new repl.REPLServer('debug> ', streams,
                                   this.controlEval.bind(this), false, true);
 
-  // Kill child process when repl closed or main process is dead
-  this.repl.rli.addListener('close', function() {
-    self.killed = true;
-    self.killChild();
-  });
-
+  // Kill child process when main process dies
   process.on('exit', function() {
     self.killChild();
   });