Run dartfmt on all files under runtime.

runtime/bin/io_service_patch.dart

Index: runtime/bin/io_service_patch.dart
diff --git a/runtime/bin/io_service_patch.dart b/runtime/bin/io_service_patch.dart
index 3ae7d922a1fda14f6879e3d365283418134edcd3..20cc5aa7a10ee33ca60885d8d91c61345ea24a15 100644
--- a/runtime/bin/io_service_patch.dart
+++ b/runtime/bin/io_service_patch.dart
@@ -2,7 +2,8 @@
 // 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.
 
-@patch class _IOService {
+@patch
+class _IOService {
   // Lazy initialize service ports, 32 per isolate.
   static const int _SERVICE_PORT_COUNT = 32;
   static List<SendPort> _servicePort = new List(_SERVICE_PORT_COUNT);
@@ -11,7 +12,8 @@
   static Map<int, Completer> _messageMap = {};
   static int _id = 0;
 
-  @patch static Future _dispatch(int request, List data) {
+  @patch
+  static Future _dispatch(int request, List data) {
     int id;
     do {
       id = _getNextId();