Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/policy/policy_statistics_collector.h

 // 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.
 
 #ifndef CHROME_BROWSER_POLICY_POLICY_STATISTICS_COLLECTOR_H_
 #define CHROME_BROWSER_POLICY_POLICY_STATISTICS_COLLECTOR_H_
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 
 class PrefService;
+class PrefServiceSimple;
 
 namespace base {
 class TaskRunner;
 }
 
 namespace policy {
 
 class PolicyService;
 
 // Manages regular updates of policy usage UMA histograms.
 class PolicyStatisticsCollector {
  public:
   // Policy usage statistics update rate, in milliseconds.
   static const int kStatisticsUpdateRate;
 
   // Neither |policy_service| nor |prefs| can be NULL and must stay valid
   // throughout the lifetime of PolicyStatisticsCollector.
   PolicyStatisticsCollector(PolicyService* policy_service,
                             PrefService* prefs,
                             const scoped_refptr<base::TaskRunner>& task_runner);
   virtual ~PolicyStatisticsCollector();
 
   // Completes initialization and starts periodical statistic updates.
   void Initialize();
 
-  static void RegisterPrefs(PrefService* prefs);
+  static void RegisterPrefs(PrefServiceSimple* prefs);
 
  protected:
   // protected virtual for mocking.
   virtual void RecordPolicyUse(int id);
 
  private:
   void CollectStatistics();
   void ScheduleUpdate(base::TimeDelta delay);
 
   int max_policy_id_;
 
   PolicyService* policy_service_;
   PrefService* prefs_;
 
   base::CancelableClosure update_callback_;
 
   const scoped_refptr<base::TaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PolicyStatisticsCollector);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_POLICY_STATISTICS_COLLECTOR_H_