[Sync] Move //components/sync to the syncer namespace.

components/sync/device_info/device_count_metrics_provider.cc

 // 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.
 
 #include "components/sync/device_info/device_count_metrics_provider.h"
 
 #include <algorithm>
 
 #include "base/metrics/sparse_histogram.h"
 #include "components/sync/device_info/device_info_tracker.h"
 
-namespace sync_driver {
+namespace syncer {
 
 DeviceCountMetricsProvider::DeviceCountMetricsProvider(
     const ProvideTrackersCallback& provide_trackers)
     : provide_trackers_(provide_trackers) {}
 
 DeviceCountMetricsProvider::~DeviceCountMetricsProvider() {}
 
 int DeviceCountMetricsProvider::MaxActiveDeviceCount() const {
-  std::vector<const sync_driver::DeviceInfoTracker*> trackers;
+  std::vector<const DeviceInfoTracker*> trackers;
   provide_trackers_.Run(&trackers);
   int max = 0;
   for (auto* tracker : trackers) {
     max = std::max(max, tracker->CountActiveDevices());
   }
   return max;
 }
 
 void DeviceCountMetricsProvider::ProvideGeneralMetrics(
     metrics::ChromeUserMetricsExtension* uma_proto) {
   UMA_HISTOGRAM_SPARSE_SLOWLY("Sync.DeviceCount",
                               std::min(MaxActiveDeviceCount(), 100));
 }
 
-}  // namespace sync_driver
+}  // namespace syncer