sync: Merge apply updates and resolve conflicts

sync/engine/apply_updates_command.h

-// Copyright (c) 2012 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 SYNC_ENGINE_APPLY_UPDATES_COMMAND_H_
-#define SYNC_ENGINE_APPLY_UPDATES_COMMAND_H_
-
-#include "base/compiler_specific.h"
-#include "sync/engine/model_changing_syncer_command.h"
-
-namespace syncer {
-
-class ApplyUpdatesCommand : public ModelChangingSyncerCommand {
- public:
-  ApplyUpdatesCommand();
-  virtual ~ApplyUpdatesCommand();
-
- protected:
-  // ModelChangingSyncerCommand implementation.
-  virtual std::set<ModelSafeGroup> GetGroupsToChange(
-      const sessions::SyncSession& session) const OVERRIDE;
-  virtual SyncerError ModelChangingExecuteImpl(
-      sessions::SyncSession* session) OVERRIDE;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ApplyUpdatesCommand);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_ENGINE_APPLY_UPDATES_COMMAND_H_