Run dartfmt on all files under runtime.

runtime/lib/schedule_microtask_patch.dart

Index: runtime/lib/schedule_microtask_patch.dart
diff --git a/runtime/lib/schedule_microtask_patch.dart b/runtime/lib/schedule_microtask_patch.dart
index 739f1f8351e8a98fc0f8a74fa0c728fd83a0e12c..71ea2706e89135b4b158066c9ad38349a87a12f3 100644
--- a/runtime/lib/schedule_microtask_patch.dart
+++ b/runtime/lib/schedule_microtask_patch.dart
@@ -2,8 +2,10 @@
 // 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 _AsyncRun {
-  @patch static void _scheduleImmediate(void callback()) {
+@patch
+class _AsyncRun {
+  @patch
+  static void _scheduleImmediate(void callback()) {
     if (_ScheduleImmediate._closure == null) {
       throw new UnsupportedError("Microtasks are not supported");
     }