Revert of Deletes mojo::Callback

services/user/user_shell_client.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_USER_USER_SHELL_CLIENT_H_
 #define SERVICES_USER_USER_SHELL_CLIENT_H_
 
-#include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "components/filesystem/lock_table.h"
 #include "components/leveldb/public/interfaces/leveldb.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/cpp/interface_factory.h"
 #include "services/shell/public/cpp/shell_client.h"
 #include "services/user/public/interfaces/user_service.mojom.h"
 
 namespace user_service {
 
@@ skipping 41 matching lines @@
 
   class LevelDBServiceObjects;
   std::unique_ptr<LevelDBServiceObjects> leveldb_objects_;
 
   DISALLOW_COPY_AND_ASSIGN(UserShellClient);
 };
 
 }  // namespace user_service
 
 #endif  // SERVICES_USER_USER_SHELL_CLIENT_H_