Remove dependency on webview_flutter.

Author: timbotimbo

lib/src/web/web_unity_widget_view.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:webview_flutter/webview_flutter.dart';
+import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';
+// ignore: unused_import
+import 'package:webview_flutter_web/webview_flutter_web.dart'; // used indirectly through webview_flutter_platform_interface
 
 class WebUnityWidgetView extends StatefulWidget {
   const WebUnityWidgetView({
@@ -16,9 +18,12 @@ class WebUnityWidgetView extends StatefulWidget {
 }
 
 class _WebUnityWidgetViewState extends State<WebUnityWidgetView> {
-  final WebViewController _controller = WebViewController()
-    ..loadRequest(
-      Uri.parse('${_getBasePath()}/UnityLibrary/index.html'),
+  final PlatformWebViewController _controller = PlatformWebViewController(
+    const PlatformWebViewControllerCreationParams(),
+  )..loadRequest(
+      LoadRequestParams(
+        uri: Uri.parse('${_getBasePath()}/UnityLibrary/index.html'),
+      ),
     );
 
   @override
@@ -34,7 +39,9 @@ class _WebUnityWidgetViewState extends State<WebUnityWidgetView> {
 
   @override
   Widget build(BuildContext context) {
-    return WebViewWidget(controller: _controller);
+    return PlatformWebViewWidget(
+      PlatformWebViewWidgetCreationParams(controller: _controller),
+    ).build(context);
   }
 
   static String _getBasePath() {

pubspec.yaml

@@ -19,8 +19,8 @@ dependencies:
   flutter_plugin_android_lifecycle: ^2.0.7
   stream_transform: ^2.0.0
   plugin_platform_interface: ^2.1.2
-  webview_flutter: ^4.0.0
-  webview_flutter_web: ^0.2.2
+  webview_flutter_web: ^0.2.2+4
+  webview_flutter_platform_interface: ^2.0.0
   web: '>=0.3.0 <2.0.0' # Needs to resolve to >=0.5.0 to use WebAssembly (WASM).
 #  ffi: ^1.2.1 // required for windows support