Revert "Fix observatory tests broken by running dartfmt."

runtime/observatory/tests/observatory_ui/mocks/repositories/field.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 mocks;
 
-typedef Future<M.Field> FieldRepositoryMockCallback(
-    M.IsolateRef isolate, String id);
+typedef Future<M.Field> FieldRepositoryMockCallback(M.IsolateRef isolate,
+                                                    String id);
 
 class FieldRepositoryMock implements M.FieldRepository {
   final FieldRepositoryMockCallback _get;
 
-  FieldRepositoryMock({FieldRepositoryMockCallback getter}) : _get = getter;
+  FieldRepositoryMock({FieldRepositoryMockCallback getter})
+    : _get = getter;
 
-  Future<M.Field> get(M.IsolateRef isolate, String id) {
+  Future<M.Field> get(M.IsolateRef isolate, String id){
     if (_get != null) {
       return _get(isolate, id);
     }
     return new Future.value(null);
   }
 }