Fix memory leak in Overlay.wrap. (#145744)

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

@@ -863,6 +863,12 @@ class _WrappingOverlayState extends State<_WrappingOverlay> {
     _entry.markNeedsBuild();
   }
 
+  @override
+  void dispose() {
+    _entry..remove()..dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Overlay(

packages/flutter/test/widgets/overlay_test.dart

@@ -1550,10 +1550,7 @@ void main() {
     });
   });
 
-  testWidgets('Overlay.wrap',
-  // TODO(ksokolovskyi): dispose OverlayEntry, https://github.com/flutter/flutter/issues/145687 [leaks-to-clean]
-  experimentalLeakTesting: LeakTesting.settings.withIgnoredAll(),
-  (WidgetTester tester) async {
+  testWidgets('Overlay.wrap', (WidgetTester tester) async {
     await tester.pumpWidget(
       Directionality(
         textDirection: TextDirection.ltr,
@@ -1585,10 +1582,7 @@ void main() {
     expect(tester.state(find.byType(Overlay)), same(overlayState));
   });
 
-  testWidgets('Overlay.wrap is sized by child in an unconstrained environment',
-  // TODO(ksokolovskyi): dispose OverlayEntry, https://github.com/flutter/flutter/issues/145687 [leaks-to-clean]
-  experimentalLeakTesting: LeakTesting.settings.withIgnoredAll(),
-  (WidgetTester tester) async {
+  testWidgets('Overlay.wrap is sized by child in an unconstrained environment', (WidgetTester tester) async {
     await tester.pumpWidget(
       Directionality(
         textDirection: TextDirection.ltr,