remove debug code

flutter/example/lib/main.dart

@@ -85,19 +85,7 @@ class MyApp extends StatefulWidget {
   _MyAppState createState() => _MyAppState();
 }
 
-class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
-
-  @override
-  void initState() {
-    super.initState();
-    WidgetsBinding.instance.addObserver(this);
-  }
-
-  @override
-  void dispose() {
-    WidgetsBinding.instance.removeObserver(this);
-    super.dispose();
-  }
+class _MyAppState extends State<MyApp> {
 
   @override
   Widget build(BuildContext context) {
@@ -116,30 +104,6 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
       ),
     );
   }
-
-  @override
-  void didChangeAppLifecycleState(AppLifecycleState state) {
-    super.didChangeAppLifecycleState(state);
-    if (state == AppLifecycleState.paused) {
-      print('App is going into the background');
-      Future.delayed(const Duration(seconds: 2), () async {
-        // This code will be executed 2 seconds after the app goes into the background
-        print('Trigger exception in background');
-        await _exceptionInBackground();
-      });
-    }
-  }
-
-  Future<void> _exceptionInBackground() async {
-    try {
-      throw Exception('_exceptionInBackground 2');
-    } catch (exception, stackTrace) {
-      await Sentry.captureException(
-        exception,
-        stackTrace: stackTrace,
-      );
-    }
-  }
 }
 
 class MainScaffold extends StatelessWidget {