Run dartfmt on all files under runtime.

runtime/observatory/tests/service/mirror_references_test.dart

 // Copyright (c) 2014, 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.
 // VMOptions=--error_on_bad_type --error_on_bad_override
 
 library vm_references_test;
 
 import 'dart:mirrors';
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 
-class Foo { }
+class Foo {}
 
 Foo foo;
 var /*MirrorReference*/ ref;
 
 void script() {
   foo = new Foo();
   ClassMirror fooClassMirror = reflectClass(Foo);
   InstanceMirror fooClassMirrorMirror = reflect(fooClassMirror);
   LibraryMirror libmirrors = fooClassMirrorMirror.type.owner;
-  ref = reflect(fooClassMirror).getField(MirrorSystem.getSymbol('_reflectee', libmirrors)).reflectee;
+  ref = reflect(fooClassMirror)
+      .getField(MirrorSystem.getSymbol('_reflectee', libmirrors))
+      .reflectee;
 }
 
 var tests = [
-
   (Isolate isolate) async {
     var lib = await isolate.rootLibrary.load();
     Field fooField = lib.variables.singleWhere((v) => v.name == 'foo');
     await fooField.load();
     Instance foo = fooField.staticValue;
     Field refField = lib.variables.singleWhere((v) => v.name == 'ref');
     await refField.load();
     Instance ref = refField.staticValue;
 
     expect(foo.isMirrorReference, isFalse);
     expect(ref.isMirrorReference, isTrue);
     expect(ref.referent, isNull);
     var loadedRef = await ref.load();
     expect(loadedRef.referent, isNotNull);
     expect(loadedRef.referent.name, equals('Foo'));
     expect(loadedRef.referent, equals(foo.clazz));
   },
-
 ];
 
 main(args) => runIsolateTests(args, tests, testeeBefore: script);