Remove UrlLauncher class

packages/url-launcher/example/lib/main.dart

@@ -28,7 +28,7 @@ class MyHomePage extends StatefulWidget {
 
 class _MyHomePageState extends State<MyHomePage> {
   void _launchUrl() {
-    UrlLauncher.launch("https://flutter.io");
+    launch('https://flutter.io');
   }
 
   @override
@@ -54,4 +54,4 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
     );
   }
-}
+}

packages/url-launcher/lib/url_launcher.dart

@@ -2,12 +2,11 @@ import 'dart:async';
 
 import 'package:flutter/services.dart';
 
-class UrlLauncher {
-  static const MethodChannel _channel =
-      const MethodChannel('plugins.flutter.io/URLLauncher');
-
-  /// Parse the specified URL string and delegate handling of the same to the
-  /// underlying platform.
-  static Future<Null> launch(String urlString) =>
-      _channel.invokeMethod('UrlLauncher.launch', urlString);
+/// Parse the specified URL string and delegate handling of the same to the
+/// underlying platform.
+Future<Null> launch(String urlString) {
+  return const MethodChannel('plugins.flutter.io/URLLauncher').invokeMethod(
+    'UrlLauncher.launch',
+    urlString,
+  );
 }