Removed deprecated NavigatorState.focusScopeNode (#139260)

Part of https://github.com/flutter/flutter/issues/139243

Deprecated in https://github.com/flutter/flutter/pull/109702

The replacement for focusScopeNode is focusNode.enclosingScope

packages/flutter/lib/fix_data/fix_widgets/fix_widgets.yaml

@@ -23,6 +23,17 @@
 #     * ListWheelScrollView: fix_list_wheel_scroll_view.yaml
 version: 1
 transforms:
+  # Changes made in TBD
+  - title: "Migrate to focusNode.enclosingScope!"
+    date: 2023-11-29
+    element:
+      uris: [ 'widgets.dart', 'material.dart', 'cupertino.dart' ]
+      getter: 'focusScopeNode'
+      inClass: 'NavigatorState'
+    changes:
+      - kind: 'rename'
+        newName: 'focusNode.enclosingScope!'
+
   # Changes made in https://github.com/flutter/flutter/pull/138509
   - title: "Migrate to 'PlatformMenuBar.child'"
     date: 2023-11-15

packages/flutter/lib/src/widgets/navigator.dart

@@ -3505,13 +3505,6 @@ class NavigatorState extends State<Navigator> with TickerProviderStateMixin, Res
   final Queue<_NavigatorObservation> _observedRouteAdditions = Queue<_NavigatorObservation>();
   final Queue<_NavigatorObservation> _observedRouteDeletions = Queue<_NavigatorObservation>();
 
-  /// The [FocusScopeNode] for the [FocusScope] that encloses the topmost navigator.
-  @Deprecated(
-    'Use focusNode.enclosingScope! instead. '
-    'This feature was deprecated after v3.1.0-0.0.pre.'
-  )
-  FocusScopeNode get focusScopeNode => focusNode.enclosingScope!;
-
   /// The [FocusNode] for the [Focus] that encloses the routes.
   final FocusNode focusNode = FocusNode(debugLabel: 'Navigator');
 

packages/flutter/test_fixes/widgets/widgets.dart

@@ -173,4 +173,8 @@ void main() {
 
   final PlatformMenuBar platformMenuBar = PlatformMenuBar(menus: <PlatformMenuItem>[], body: const SizedBox());
   final Widget bodyValue = platformMenuBar.body;
+
+  // Changes made in TBD
+  final NavigatorState state = Navigator.of(context);
+  state.focusScopeNode;
 }

packages/flutter/test_fixes/widgets/widgets.dart.expect

@@ -173,4 +173,8 @@ void main() {
 
   final PlatformMenuBar platformMenuBar = PlatformMenuBar(menus: <PlatformMenuItem>[], child: const SizedBox());
   final Widget bodyValue = platformMenuBar.child;
+
+  // Changes made in TBD
+  final NavigatorState state = Navigator.of(context);
+  state.focusNode.enclosingScope!;
 }