Revert "Fix observatory tests broken by running dartfmt."

runtime/observatory/tests/observatory_ui/mocks/repositories/retained_size.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.Guarded<M.Instance>> RetainedSizeRepositoryMockGetter(
-    M.IsolateRef i, String id);
+typedef Future<M.Guarded<M.Instance>>
+        RetainedSizeRepositoryMockGetter(M.IsolateRef i, String id);
 
 class RetainedSizeRepositoryMock implements M.RetainedSizeRepository {
   final RetainedSizeRepositoryMockGetter _getter;
 
   Future<M.Guarded<M.Instance>> get(M.IsolateRef i, String id) {
     if (_getter != null) {
       return _getter(i, id);
     }
     return new Future.value(
-        new GuardedMock<M.Instance>.fromSentinel(new SentinelMock()));
+      new GuardedMock<M.Instance>.fromSentinel(new SentinelMock())
+    );
   }
 
   RetainedSizeRepositoryMock({RetainedSizeRepositoryMockGetter getter})
-      : _getter = getter;
+    : _getter = getter;
 }