[web] Migrate remaining web-only API usages to `dart:ui_web` (#132248)

This is the last batch of web-only API migration.

Depends on https://github.com/flutter/engine/pull/44516

Fixes https://github.com/flutter/flutter/issues/52899
Fixes https://github.com/flutter/flutter/issues/126831

packages/flutter/lib/src/painting/_network_image_web.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 import 'dart:js_interop';
 import 'dart:ui' as ui;
+import 'dart:ui_web' as ui_web;
 
 import 'package:flutter/foundation.dart';
 import 'package:web/web.dart' as web;
@@ -117,8 +118,8 @@ class NetworkImage
   }
 
   // Html renderer does not support decoding network images to a specified size. The decode parameter
-  // here is ignored and the web-only `ui.webOnlyInstantiateImageCodecFromUrl` will be used
-  // directly in place of the typical `instantiateImageCodec` method.
+  // here is ignored and `ui_web.createImageCodecFromUrl` will be used directly
+  // in place of the typical `instantiateImageCodec` method.
   Future<ui.Codec> _loadAsync(
     NetworkImage key,
     image_provider.ImageDecoderCallback? decode,
@@ -133,7 +134,7 @@ class NetworkImage
     final bool containsNetworkImageHeaders = key.headers?.isNotEmpty ?? false;
 
     // We use a different method when headers are set because the
-    // `ui.webOnlyInstantiateImageCodecFromUrl` method is not capable of handling headers.
+    // `ui_web.createImageCodecFromUrl` method is not capable of handling headers.
     if (isCanvasKit || containsNetworkImageHeaders) {
       final Completer<web.XMLHttpRequest> completer =
           Completer<web.XMLHttpRequest>();
@@ -190,16 +191,13 @@ class NetworkImage
         return decodeDeprecated!(bytes);
       }
     } else {
-      // This API only exists in the web engine implementation and is not
-      // contained in the analyzer summary for Flutter.
-      // ignore: undefined_function, avoid_dynamic_calls
-      return ui.webOnlyInstantiateImageCodecFromUrl(
+      return ui_web.createImageCodecFromUrl(
         resolved,
         chunkCallback: (int bytes, int total) {
           chunkEvents.add(ImageChunkEvent(
               cumulativeBytesLoaded: bytes, expectedTotalBytes: total));
         },
-      ) as Future<ui.Codec>;
+      );
     }
   }
 

packages/flutter_tools/lib/src/web/bootstrap.dart

@@ -231,8 +231,8 @@ String generateTestEntrypoint({
     ui_web.debugEmulateFlutterTesterEnvironment = true;
     await ui_web.bootstrapEngine();
     webGoldenComparator = DefaultWebGoldenComparator(Uri.parse('${Uri.file(absolutePath)}'));
-    (ui.window as dynamic).debugOverrideDevicePixelRatio(3.0);
-    (ui.window as dynamic).webOnlyDebugPhysicalSizeOverride = const ui.Size(2400, 1800);
+    ui_web.debugOverrideDevicePixelRatio(3.0);
+    ui.window.debugPhysicalSizeOverride = const ui.Size(2400, 1800);
 
     internalBootstrapBrowserTest(() {
       return ${testConfigPath != null ? "() => test_config.testExecutable(test.main)" : "test.main"};