Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/chromeos/power/session_length_limiter.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_CHROMEOS_POWER_SESSION_LENGTH_LIMITER_H_
 #define CHROME_BROWSER_CHROMEOS_POWER_SESSION_LENGTH_LIMITER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/public/pref_change_registrar.h"
 #include "base/threading/thread_checker.h"
 #include "base/time.h"
 #include "base/timer.h"
 
 class PrefService;
+class PrefServiceSimple;
 
 namespace chromeos {
 
 // Enforces a session length limit by terminating the session when the limit is
 // reached.
 class SessionLengthLimiter {
  public:
   class Delegate {
    public:
     virtual ~Delegate();
 
     virtual const base::Time GetCurrentTime() const = 0;
     virtual void StopSession() = 0;
   };
 
   // Registers preferences.
-  static void RegisterPrefs(PrefService* local_state);
+  static void RegisterPrefs(PrefServiceSimple* local_state);
 
   SessionLengthLimiter(Delegate* delegate, bool browser_restarted);
   ~SessionLengthLimiter();
 
  private:
   void OnSessionLengthLimitChanged();
 
   // Starts a timer that periodically checks whether the remaining time has
   // reached zero.
   void StartTimer();
@@ skipping 13 matching lines @@
   scoped_ptr<base::RepeatingTimer<SessionLengthLimiter> > repeating_timer_;
   base::Time session_start_time_;
   base::TimeDelta session_length_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionLengthLimiter);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_POWER_SESSION_LENGTH_LIMITER_H_