[Sync] Fixing easy lint violations.

components/sync/device_info/device_info_sync_service.h

 // Copyright 2014 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 COMPONENTS_SYNC_DEVICE_INFO_DEVICE_INFO_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DEVICE_INFO_DEVICE_INFO_SYNC_SERVICE_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
+#include <vector>
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "components/sync/api/sync_change.h"
 #include "components/sync/api/sync_change_processor.h"
 #include "components/sync/api/sync_data.h"
 #include "components/sync/api/sync_error_factory.h"
 #include "components/sync/api/syncable_service.h"
@@ skipping 74 matching lines @@
 
   // Used to update our local device info once every pulse interval.
   base::OneShotTimer pulse_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceInfoSyncService);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DEVICE_INFO_DEVICE_INFO_SYNC_SERVICE_H_