Revert "Fix strong mode errors in dart:io."

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

Index: sdk/lib/_internal/js_runtime/lib/io_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/io_patch.dart b/sdk/lib/_internal/js_runtime/lib/io_patch.dart
index d941bb23e82efe2e71c13cf405fec292f3bf4dd7..4487e15bf35e8e8bae79d5cf719a70c48a44db06 100644
--- a/sdk/lib/_internal/js_runtime/lib/io_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/io_patch.dart
@@ -39,10 +39,8 @@ class _Directory {
     throw new UnsupportedError("Directory._rename");
   }
   @patch
-  static void _fillWithDirectoryListing(
-      List<FileSystemEntity> list, String path, bool recursive,
-      bool followLinks) {
-    throw new UnsupportedError("Directory._fillWithDirectoryListing");
+  static List _list(String path, bool recursive, bool followLinks) {
+    throw new UnsupportedError("Directory._list");
   }
 }
 
@@ -310,11 +308,6 @@ class InternetAddress {
       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
@@ -434,7 +427,7 @@ class _StdIOUtils {
     throw new UnsupportedError("StdIOUtils._getStdioOutputStream");
   }
   @patch
-  static int _socketType(Socket socket) {
+  static int _socketType(nativeSocket) {
     throw new UnsupportedError("StdIOUtils._socketType");
   }
   @patch