Assign late variable without initstate in flutter_gallery (#83020)

dev/integration_tests/flutter_gallery/lib/demo/cupertino/cupertino_navigation_demo.dart

@@ -302,21 +302,15 @@ class Tab1ItemPage extends StatefulWidget {
 }
 
 class Tab1ItemPageState extends State<Tab1ItemPage> {
-  @override
-  void initState() {
-    super.initState();
-    relatedColors = List<Color>.generate(10, (int index) {
-      final math.Random random = math.Random(widget.randomSeed);
-      return Color.fromARGB(
-        255,
-        (widget.color!.red + random.nextInt(100) - 50).clamp(0, 255),
-        (widget.color!.green + random.nextInt(100) - 50).clamp(0, 255),
-        (widget.color!.blue + random.nextInt(100) - 50).clamp(0, 255),
-      );
-    });
-  }
-
-  late List<Color> relatedColors;
+  late final List<Color> relatedColors = List<Color>.generate(10, (int index) {
+    final math.Random random = math.Random(widget.randomSeed);
+    return Color.fromARGB(
+      255,
+      (widget.color!.red + random.nextInt(100) - 50).clamp(0, 255),
+      (widget.color!.green + random.nextInt(100) - 50).clamp(0, 255),
+      (widget.color!.blue + random.nextInt(100) - 50).clamp(0, 255),
+    );
+  });
 
   @override
   Widget build(BuildContext context) {

dev/integration_tests/flutter_gallery/lib/gallery/app.dart

@@ -45,7 +45,7 @@ class GalleryApp extends StatefulWidget {
 class _GalleryAppState extends State<GalleryApp> {
   GalleryOptions? _options;
   Timer? _timeDilationTimer;
-  late AppStateModel model;
+  late final AppStateModel model = AppStateModel()..loadProducts();
 
   Map<String, WidgetBuilder> _buildRoutes() {
     // For a different example of how to set up an application routing table
@@ -66,7 +66,6 @@ class _GalleryAppState extends State<GalleryApp> {
       timeDilation: timeDilation,
       platform: defaultTargetPlatform,
     );
-    model = AppStateModel()..loadProducts();
   }
 
   @override