Fix strong mode errors in dart:io.

sdk/lib/_internal/js_runtime/lib/io_patch.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:_js_helper' show patch;
 
 @patch
 class _Directory {
   @patch
   static _current() {
@@ skipping 21 matching lines @@
   }
   @patch
   static _deleteNative(String path, bool recursive) {
     throw new UnsupportedError("Directory._deleteNative");
   }
   @patch
   static _rename(String path, String newPath) {
     throw new UnsupportedError("Directory._rename");
   }
   @patch
-  static List _list(String path, bool recursive, bool followLinks) {
-    throw new UnsupportedError("Directory._list");
+  static void _fillWithDirectoryListing(
+      List<FileSystemEntity> list, String path, bool recursive,
+      bool followLinks) {
+    throw new UnsupportedError("Directory._fillWithDirectoryListing");
   }
 }
 
 @patch
 class _AsyncDirectoryListerOps {
   @patch
   factory _AsyncDirectoryListerOps(int pointer) {
     throw new UnsupportedError("Directory._list");
   }
 }
@@ skipping 247 matching lines @@
   }
   @patch
   factory InternetAddress(String address) {
     throw new UnsupportedError("InternetAddress");
   }
   @patch
   static Future<List<InternetAddress>> lookup(
       String host, {InternetAddressType type: InternetAddressType.ANY}) {
     throw new UnsupportedError("InternetAddress.lookup");
   }
+  @patch
+  static InternetAddress _cloneWithNewHost(
+      InternetAddress address, String host) {
+    throw new UnsupportedError("InternetAddress._cloneWithNewHost");
+  }
 }
 
 @patch
 class NetworkInterface {
   @patch
   static bool get listSupported {
     throw new UnsupportedError("NetworkInterface.listSupported");
   }
   @patch
   static Future<List<NetworkInterface>> list({
@@ skipping 99 matching lines @@
 class _StdIOUtils {
   @patch
   static Stdin _getStdioInputStream() {
     throw new UnsupportedError("StdIOUtils._getStdioInputStream");
   }
   @patch
   static _getStdioOutputStream(int fd) {
     throw new UnsupportedError("StdIOUtils._getStdioOutputStream");
   }
   @patch
-  static int _socketType(nativeSocket) {
+  static int _socketType(Socket socket) {
     throw new UnsupportedError("StdIOUtils._socketType");
   }
   @patch
   static _getStdioHandleType(int fd) {
     throw new UnsupportedError("StdIOUtils._getStdioHandleType");
   }
 }
 
 @patch
 class _WindowsCodePageDecoder {
@@ skipping 80 matching lines @@
   }
 }
 
 @patch
 class _IOService {
   @patch
   static Future _dispatch(int request, List data) {
     throw new UnsupportedError("_IOService._dispatch");
   }
 }