[Sync] Move //components/sync_driver to //components/sync/driver.

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>
 
@@ skipping 33 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_