Flutter for web can not use flutter_webview_plugin

my code

`import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

// ignore: prefer_collection_literals
void main() {
// WidgetsFlutterBinding.ensureInitialized();
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// final _webViewPlugin = FlutterWebviewPlugin();
String filePath = 'files/test.html';

@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter WebView Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
routes: {
'/': (_) => new WebviewScaffold(
url: "https://www.google.com",
appBar: new AppBar(
title: const Text('Widget webview'),
),
withZoom: true,
hidden: true,

),
},
);
}
}
`