Run dartfmt on all files under runtime.

runtime/observatory/tests/service/field_script_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.
 
 library field_script_test;
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'service_test_common.dart';
 
 part 'field_script_other.dart';
 
 code() {
   print(otherField);
 }
 
 var tests = [
   hasPausedAtStart,
   (Isolate isolate) async {
     Library lib = await isolate.rootLibrary.load();
     var fields = lib.variables;
     expect(fields.length, 2);
     print(lib.variables);
-    for(Field f in fields) {
+    for (Field f in fields) {
       await f.load();
       String locationString = await f.location.toUserString();
       if (f.name == "tests") {
         expect(locationString, "field_script_test.dart:18:5");
       } else if (f.name == "otherField") {
         expect(locationString, "field_script_other.dart:7:5");
       } else {
         fail("Unexpected field: ${f.name}");
       }
     }
   }
 ];
 
 main(args) {
   runIsolateTestsSynchronous(args, tests,
       testeeConcurrent: code, pause_on_start: true, pause_on_exit: true);
 }