[Sync] Create //components/sync/device_info.

components/sync/device_info/device_count_metrics_provider.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 COMPONENTS_SYNC_DRIVER_DEVICE_COUNT_METRICS_PROVIDER_H_
-#define COMPONENTS_SYNC_DRIVER_DEVICE_COUNT_METRICS_PROVIDER_H_
+#ifndef COMPONENTS_SYNC_DEVICE_INFO_DEVICE_COUNT_METRICS_PROVIDER_H_
+#define COMPONENTS_SYNC_DEVICE_INFO_DEVICE_COUNT_METRICS_PROVIDER_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "components/metrics/metrics_provider.h"
 
 namespace sync_driver {
 
@@ skipping 26 matching lines @@
   // Returns the max number of active devices across all accounts.
   int MaxActiveDeviceCount() const;
 
   const ProvideTrackersCallback provide_trackers_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceCountMetricsProvider);
 };
 
 }  // namespace sync_driver
 
-#endif  // COMPONENTS_SYNC_DRIVER_DEVICE_COUNT_METRICS_PROVIDER_H_
+#endif  // COMPONENTS_SYNC_DEVICE_INFO_DEVICE_COUNT_METRICS_PROVIDER_H_