Run dartfmt on all files under runtime.

runtime/observatory/tests/service/regress_28443_test.dart

 // Copyright (c) 2017, 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:async';
 import 'test_helper.dart';
 import 'service_test_common.dart';
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 
 const int LINE_A = 28, LINE_B = 33;
 
 class VMServiceClient {
   VMServiceClient(this.x);
   close() => new Future.microtask(() => print("close"));
   var x;
 }
 
 collect() async {
   var uri = "abc";
   var vmService;
   await new Future.microtask(() async {
     try {
       vmService = new VMServiceClient(uri);
       await new Future.microtask(() => throw new TimeoutException("here"));
     } on dynamic {
       vmService.close();
-      rethrow;  // LINE_A
+      rethrow; // LINE_A
     }
   });
 }
 
-test_code() async {  // LINE_B
+test_code() async {
+  // LINE_B
   try {
     await collect();
   } on TimeoutException {
     print("ok");
   }
 }
 
 Future<Isolate> stepThroughProgram(Isolate isolate) async {
   Completer completer = new Completer();
   int pauseEventsSeen = 0;
 
   await subscribeToStream(isolate.vm, VM.kDebugStream,
       (ServiceEvent event) async {
     if (event.kind == ServiceEvent.kPauseBreakpoint) {
       // We are paused: Step further.
       pauseEventsSeen++;
       isolate.stepInto();
     } else if (event.kind == ServiceEvent.kPauseExit) {
       // We are at the exit: The test is done.
       expect(pauseEventsSeen > 20, true,
           reason: "Saw only $pauseEventsSeen pause events.");
       await cancelStreamSubscription(VM.kDebugStream);
       completer.complete();
     }
   });
   isolate.resume();
   return completer.future;
 }
 
-var tests = [hasPausedAtStart,
-             markDartColonLibrariesDebuggable,
-             setBreakpointAtLine(LINE_B),
-             resumeIsolate,
-             hasStoppedAtBreakpoint,
-             setBreakpointAtLine(LINE_A),
-             resumeIsolate,
-             hasStoppedAtBreakpoint,
-             stepOut,
-             stoppedAtLine(LINE_B),
-             resumeIsolate];
+var tests = [
+  hasPausedAtStart,
+  markDartColonLibrariesDebuggable,
+  setBreakpointAtLine(LINE_B),
+  resumeIsolate,
+  hasStoppedAtBreakpoint,
+  setBreakpointAtLine(LINE_A),
+  resumeIsolate,
+  hasStoppedAtBreakpoint,
+  stepOut,
+  stoppedAtLine(LINE_B),
+  resumeIsolate
+];
 
 main(args) => runIsolateTestsSynchronous(args, tests,
     testeeConcurrent: test_code, pause_on_start: true, pause_on_exit: false);