Rename Sample classes (#124080)

Rename Sample classes
diff --git a/examples/api/lib/widgets/layout_builder/layout_builder.0.dart b/examples/api/lib/widgets/layout_builder/layout_builder.0.dart
index 07dbaad..b0254f7 100644
--- a/examples/api/lib/widgets/layout_builder/layout_builder.0.dart
+++ b/examples/api/lib/widgets/layout_builder/layout_builder.0.dart
@@ -2,28 +2,25 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flutter code sample for [LayoutBuilder].
-
 import 'package:flutter/material.dart';
 
-void main() => runApp(const MyApp());
+/// Flutter code sample for [LayoutBuilder].
 
-class MyApp extends StatelessWidget {
-  const MyApp({super.key});
+void main() => runApp(const LayoutBuilderExampleApp());
 
-  static const String _title = 'Flutter Code Sample';
+class LayoutBuilderExampleApp extends StatelessWidget {
+  const LayoutBuilderExampleApp({super.key});
 
   @override
   Widget build(BuildContext context) {
     return const MaterialApp(
-      title: _title,
-      home: MyStatelessWidget(),
+      home: LayoutBuilderExample(),
     );
   }
 }
 
-class MyStatelessWidget extends StatelessWidget {
-  const MyStatelessWidget({super.key});
+class LayoutBuilderExample extends StatelessWidget {
+  const LayoutBuilderExample({super.key});
 
   @override
   Widget build(BuildContext context) {