Convert //components/sync_driver from scoped_ptr to std::unique_ptr

components/sync_driver/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_
 
+#include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/metrics/metrics_provider.h"
 
 namespace sync_driver {
 
 class DeviceInfoTracker;
 
 // A registerable metrics provider that will emit the number of active syncing
 // devices a user has upon UMA upload. When there are multiple active profiles
 // that are aware of syncable devices, the largest count is used. This approach
 // is useful for several reasons. We're significantly interested in "power"
@@ skipping 21 matching lines @@
   int MaxActiveDeviceCount() const;
 
   const ProvideTrackersCallback provide_trackers_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceCountMetricsProvider);
 };
 
 }  // namespace sync_driver
 
 #endif  // COMPONENTS_SYNC_DRIVER_DEVICE_COUNT_METRICS_PROVIDER_H_