[webview_flutter] Complete move to federated architecture

packages/webview_flutter/webview_flutter/analysis_options.yaml

@@ -0,0 +1 @@
+include: ../../../analysis_options_legacy.yaml

packages/webview_flutter/webview_flutter/example/integration_test/webview_flutter_test.dart

@@ -11,7 +11,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:webview_flutter/platform_interface.dart';
 import 'package:webview_flutter/webview_flutter.dart';
 import 'package:integration_test/integration_test.dart';
 
@@ -882,7 +881,7 @@ void main() {
 
   group('SurfaceAndroidWebView', () {
     setUpAll(() {
-      WebView.platform = SurfaceAndroidWebView();
+      // WebView.platform = SurfaceAndroidWebView();
     });
 
     tearDownAll(() {

packages/webview_flutter/webview_flutter/example/lib/main.dart

@@ -6,7 +6,6 @@
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:webview_flutter/webview_flutter.dart';
 
@@ -39,7 +38,6 @@ class _WebViewExampleState extends State<WebViewExample> {
   @override
   void initState() {
     super.initState();
-    if (Platform.isAndroid) WebView.platform = SurfaceAndroidWebView();
   }
 
   @override
@@ -300,6 +298,7 @@ class NavigationControls extends StatelessWidget {
       future: _webViewControllerFuture,
       builder:
           (BuildContext context, AsyncSnapshot<WebViewController> snapshot) {
+        if (!snapshot.hasData) return Container();
         final bool webViewReady =
             snapshot.connectionState == ConnectionState.done;
         final WebViewController controller = snapshot.data!;