Use dartfmt on Observatory code

runtime/observatory/lib/src/repositories/flag.dart

 // Copyright (c) 2016, 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
 
 part of repositories;
 
 class Flag implements M.Flag {
   final String name;
   final String comment;
   final bool modified;
   final String valueAsString;
   Flag(this.name, this.comment, this.modified, this.valueAsString) {
     assert(name != null);
     assert(comment != null);
     assert(modified != null);
   }
 }
 
 class FlagsRepository implements M.FlagsRepository {
   final S.VM vm;
 
   FlagsRepository(this.vm);
 
-  Future<Iterable<Flag>> list() async{
+  Future<Iterable<Flag>> list() async {
     List<Map> flags = ((await vm.getFlagList()) as S.ServiceMap)['flags'];
     return flags.map(_toFlag);
   }
 
-  static _toFlag(Map map){
-    return new Flag(map['name'],
-                    map['comment'],
-                    map['modified'],
-                    map['valueAsString']);
+  static _toFlag(Map map) {
+    return new Flag(
+        map['name'], map['comment'], map['modified'], map['valueAsString']);
   }
 }