Update for Flutter 3.10 beta (#1746)

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [ ] All existing and new tests are passing.

---------

Co-authored-by: David Iglesias <ditman@gmail.com>
Co-authored-by: Mark Thompson <2554588+MarkTechson@users.noreply.github.com>
Co-authored-by: John Ryan <ryjohn@google.com>

web_embedding/ng-flutter/flutter/lib/src/js_interop.dart

@@ -1,4 +1,3 @@
-
 /// Exposes useful functions to interop with JS from our Flutter app.
 library example_js_interop;
 

web_embedding/ng-flutter/flutter/lib/src/js_interop/counter_state_manager.dart

@@ -24,7 +24,9 @@ class DemoAppStateManager {
     required ValueNotifier<DemoScreen> screen,
     required ValueNotifier<int> counter,
     required ValueNotifier<String> text,
-  }) : _counter = counter, _text = text, _screen = screen;
+  })  : _counter = counter,
+        _text = text,
+        _screen = screen;
 
   final ValueNotifier<DemoScreen> _screen;
   final ValueNotifier<int> _counter;
@@ -34,12 +36,15 @@ class DemoAppStateManager {
   int getClicks() {
     return _counter.value;
   }
+
   void setClicks(int value) {
     _counter.value = value;
   }
+
   void incrementClicks() {
     _counter.value++;
   }
+
   void decrementClicks() {
     _counter.value--;
   }

web_embedding/ng-flutter/flutter/lib/src/js_interop/dom.dart

@@ -12,7 +12,8 @@ class DomCustomEvent {
   external factory DomCustomEvent.withOptions(JSString type, JSAny options);
   factory DomCustomEvent._(String type, [Object? options]) {
     if (options != null) {
-      return DomCustomEvent.withOptions(type.toJS, js_util.jsify(options) as JSAny);
+      return DomCustomEvent.withOptions(
+          type.toJS, js_util.jsify(options) as JSAny);
     }
     return DomCustomEvent.withType(type.toJS);
   }
@@ -31,6 +32,7 @@ dispatchCustomEvent(DomElement target, String type, Object data) {
 @JS()
 @staticInterop
 class DomEventTarget {}
+
 extension DomEventTargetExtension on DomEventTarget {
   @JS('dispatchEvent')
   external JSBoolean _dispatchEvent(DomCustomEvent event);
@@ -40,6 +42,7 @@ extension DomEventTargetExtension on DomEventTarget {
 @JS()
 @staticInterop
 class DomElement extends DomEventTarget {}
+
 extension DomElementExtension on DomElement {
   @JS('querySelector')
   external DomElement? _querySelector(JSString selectors);