Run dartfmt on all files under runtime.

runtime/bin/eventhandler_patch.dart

Index: runtime/bin/eventhandler_patch.dart
diff --git a/runtime/bin/eventhandler_patch.dart b/runtime/bin/eventhandler_patch.dart
index 588a4b82ab129ee7395b14c50b967dd6a34ed19d..e222ed1614d9bd5151cf29747ff321c5da2217f3 100644
--- a/runtime/bin/eventhandler_patch.dart
+++ b/runtime/bin/eventhandler_patch.dart
@@ -2,13 +2,12 @@
 // 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 _EventHandler {
-  @patch static void _sendData(Object sender,
-                                    SendPort sendPort,
-                                    int data)
+@patch
+class _EventHandler {
+  @patch
+  static void _sendData(Object sender, SendPort sendPort, int data)
       native "EventHandler_SendData";
 
   static int _timerMillisecondClock()
       native "EventHandler_TimerMillisecondClock";
 }
-