Remove the Window class now that it is no longer used. (flutter/engine#22505)

This removes the Window class, now that the framework no longer uses it.

engine/src/flutter/lib/ui/window.dart

@@ -795,220 +795,6 @@ class AccessibilityFeatures {
   int get hashCode => _index.hashCode;
 }
 
-/// A soon-to-be deprecated class that is wholly replaced by
-/// [SingletonFlutterWindow].
-///
-/// This class will be removed once the framework no longer refers to it.
-// In order for the documentation build to succeed, this interface duplicates
-// all of the methods with documentation, overrides them, and calls the super
-// implementation. Once this merges into the framework and the framework
-// references to it can be updated, this class will be removed entirely.
-class Window extends SingletonFlutterWindow {
-  Window._(Object windowId, PlatformDispatcher platformDispatcher)
-      : super._(windowId, platformDispatcher);
-
-  @override
-  // ignore: unnecessary_overrides
-  double get devicePixelRatio => super.devicePixelRatio;
-
-  @override
-  // ignore: unnecessary_overrides
-  Rect get physicalGeometry => super.physicalGeometry;
-
-  @override
-  // ignore: unnecessary_overrides
-  Size get physicalSize => super.physicalSize;
-
-  @override
-  // ignore: unnecessary_overrides
-  WindowPadding get viewInsets => super.viewInsets;
-
-  @override
-  // ignore: unnecessary_overrides
-  WindowPadding get viewPadding => super.viewPadding;
-
-  @override
-  // ignore: unnecessary_overrides
-  WindowPadding get systemGestureInsets => super.systemGestureInsets;
-
-  @override
-  // ignore: unnecessary_overrides
-  WindowPadding get padding => super.padding;
-
-  @override
-  // ignore: unnecessary_overrides
-  void render(Scene scene) => super.render(scene);
-
-  @override
-  // ignore: unnecessary_overrides
-  VoidCallback? get onMetricsChanged => super.onMetricsChanged;
-  @override
-  // ignore: unnecessary_overrides
-  set onMetricsChanged(VoidCallback? callback) {
-    super.onMetricsChanged = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  Locale get locale => super.locale;
-
-  @override
-  // ignore: unnecessary_overrides
-  List<Locale> get locales => super.locales;
-
-  @override
-  // ignore: unnecessary_overrides
-  Locale? computePlatformResolvedLocale(List<Locale> supportedLocales) {
-    return super.computePlatformResolvedLocale(supportedLocales);
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  VoidCallback? get onLocaleChanged => super.onLocaleChanged;
-  @override
-  // ignore: unnecessary_overrides
-  set onLocaleChanged(VoidCallback? callback) {
-    super.onLocaleChanged = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  String get initialLifecycleState => super.initialLifecycleState;
-
-  @override
-  // ignore: unnecessary_overrides
-  double get textScaleFactor => super.textScaleFactor;
-
-  @override
-  // ignore: unnecessary_overrides
-  bool get alwaysUse24HourFormat => super.alwaysUse24HourFormat;
-
-  @override
-  // ignore: unnecessary_overrides
-  VoidCallback? get onTextScaleFactorChanged => super.onTextScaleFactorChanged;
-  @override
-  // ignore: unnecessary_overrides
-  set onTextScaleFactorChanged(VoidCallback? callback) {
-    super.onTextScaleFactorChanged = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  Brightness get platformBrightness => super.platformBrightness;
-
-  @override
-  // ignore: unnecessary_overrides
-  VoidCallback? get onPlatformBrightnessChanged => super.onPlatformBrightnessChanged;
-  @override
-  // ignore: unnecessary_overrides
-  set onPlatformBrightnessChanged(VoidCallback? callback) {
-    super.onPlatformBrightnessChanged = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  FrameCallback? get onBeginFrame => super.onBeginFrame;
-  @override
-  // ignore: unnecessary_overrides
-  set onBeginFrame(FrameCallback? callback) {
-    super.onBeginFrame = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  VoidCallback? get onDrawFrame => super.onDrawFrame;
-  @override
-  // ignore: unnecessary_overrides
-  set onDrawFrame(VoidCallback? callback) {
-    super.onDrawFrame = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  TimingsCallback? get onReportTimings => super.onReportTimings;
-  @override
-  // ignore: unnecessary_overrides
-  set onReportTimings(TimingsCallback? callback) {
-    super.onReportTimings = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  PointerDataPacketCallback? get onPointerDataPacket => super.onPointerDataPacket;
-  @override
-  // ignore: unnecessary_overrides
-  set onPointerDataPacket(PointerDataPacketCallback? callback) {
-    super.onPointerDataPacket = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  String get defaultRouteName => super.defaultRouteName;
-
-  @override
-  // ignore: unnecessary_overrides
-  void scheduleFrame() => super.scheduleFrame();
-
-  @override
-  // ignore: unnecessary_overrides
-  bool get semanticsEnabled => super.semanticsEnabled;
-
-  @override
-  // ignore: unnecessary_overrides
-  VoidCallback? get onSemanticsEnabledChanged => super.onSemanticsEnabledChanged;
-  @override
-  // ignore: unnecessary_overrides
-  set onSemanticsEnabledChanged(VoidCallback? callback) {
-    super.onSemanticsEnabledChanged = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  SemanticsActionCallback? get onSemanticsAction => super.onSemanticsAction;
-  @override
-  // ignore: unnecessary_overrides
-  set onSemanticsAction(SemanticsActionCallback? callback) {
-    super.onSemanticsAction = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  AccessibilityFeatures get accessibilityFeatures => super.accessibilityFeatures;
-
-  @override
-  // ignore: unnecessary_overrides
-  VoidCallback? get onAccessibilityFeaturesChanged =>
-      super.onAccessibilityFeaturesChanged;
-  @override
-  // ignore: unnecessary_overrides
-  set onAccessibilityFeaturesChanged(VoidCallback? callback) {
-    super.onAccessibilityFeaturesChanged = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  void updateSemantics(SemanticsUpdate update) => super.updateSemantics(update);
-
-  @override
-  // ignore: unnecessary_overrides
-  void sendPlatformMessage(String name, ByteData? data, PlatformMessageResponseCallback? callback) {
-    super.sendPlatformMessage(name, data, callback);
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  PlatformMessageCallback? get onPlatformMessage => super.onPlatformMessage;
-  @override
-  // ignore: unnecessary_overrides
-  set onPlatformMessage(PlatformMessageCallback? callback) {
-    super.onPlatformMessage = callback;
-  }
-
-  @override
-  // ignore: unnecessary_overrides
-  void setIsolateDebugName(String name) => super.setIsolateDebugName(name);
-}
-
 /// Describes the contrast of a theme or color palette.
 enum Brightness {
   /// The color is dark and will require a light text color to achieve readable
@@ -1053,4 +839,4 @@ enum Brightness {
 /// * [PlatformDispatcher.views], contains the current list of Flutter windows
 ///   belonging to the application, including top level application windows like
 ///   this one.
-final Window window = Window._(0, PlatformDispatcher.instance);
+final SingletonFlutterWindow window = SingletonFlutterWindow._(0, PlatformDispatcher.instance);

engine/src/flutter/lib/web_ui/lib/src/engine/html/scene_builder.dart

@@ -307,13 +307,12 @@ class SurfaceSceneBuilder implements ui.SceneBuilder {
   ///  - 0x08: visualizeEngineStatistics - graph UI thread frame times
   /// Set enabledOptions to 0x0F to enable all the currently defined features.
   ///
-  /// The "UI thread" is the thread that includes all the execution of
-  /// the main Dart isolate (the isolate that can call
-  /// [Window.render]). The UI thread frame time is the total time
-  /// spent executing the [Window.onBeginFrame] callback. The "raster
-  /// thread" is the thread (running on the CPU) that subsequently
-  /// processes the [Scene] provided by the Dart code to turn it into
-  /// GPU commands and send it to the GPU.
+  /// The "UI thread" is the thread that includes all the execution of the main
+  /// Dart isolate (the isolate that can call [FlutterView.render]). The UI
+  /// thread frame time is the total time spent executing the
+  /// [FlutterView.onBeginFrame] callback. The "raster thread" is the thread
+  /// (running on the CPU) that subsequently processes the [Scene] provided by
+  /// the Dart code to turn it into GPU commands and send it to the GPU.
   ///
   /// See also the [PerformanceOverlayOption] enum in the rendering library.
   /// for more details.
@@ -522,7 +521,7 @@ class SurfaceSceneBuilder implements ui.SceneBuilder {
   ///
   /// Returns a [Scene] containing the objects that have been added to
   /// this scene builder. The [Scene] can then be displayed on the
-  /// screen with [Window.render].
+  /// screen with [FlutterView.render].
   ///
   /// After calling this function, the scene builder object is invalid and
   /// cannot be used further.

engine/src/flutter/lib/web_ui/lib/src/engine/platform_dispatcher.dart

@@ -174,7 +174,7 @@ class EnginePlatformDispatcher extends ui.PlatformDispatcher {
   /// rasterized frames.
   ///
   /// It's preferred to use [SchedulerBinding.addTimingsCallback] than to use
-  /// [Window.onReportTimings] directly because
+  /// [PlatformDispatcher.onReportTimings] directly because
   /// [SchedulerBinding.addTimingsCallback] allows multiple callbacks.
   ///
   /// This can be used to see if the application has missed frames (through