Clean up sparse_histogram.h header

components/policy/core/common/policy_statistics_collector.cc

 // Copyright (c) 2012 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/policy/core/common/policy_statistics_collector.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/logging.h"
-#include "base/metrics/sparse_histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/task_runner.h"
 #include "components/policy/core/common/policy_pref_names.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 
 namespace policy {
 
 const int PolicyStatisticsCollector::kStatisticsUpdateRate =
     24 * 60 * 60 * 1000;  // 24 hours.
@@ skipping 60 matching lines @@
 }
 
 void PolicyStatisticsCollector::ScheduleUpdate(base::TimeDelta delay) {
   update_callback_.Reset(base::Bind(
       &PolicyStatisticsCollector::CollectStatistics,
       base::Unretained(this)));
   task_runner_->PostDelayedTask(FROM_HERE, update_callback_.callback(), delay);
 }
 
 }  // namespace policy