Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/chromeos/power/session_length_limiter.h

Index: chrome/browser/chromeos/power/session_length_limiter.h
diff --git a/chrome/browser/chromeos/power/session_length_limiter.h b/chrome/browser/chromeos/power/session_length_limiter.h
index ebeb3551271301a2cd76204f349380ab7caad381..c6f82711f96da23384355ebda73c66301a512652 100644
--- a/chrome/browser/chromeos/power/session_length_limiter.h
+++ b/chrome/browser/chromeos/power/session_length_limiter.h
@@ -13,7 +13,7 @@
 #include "base/timer.h"
 
 class PrefService;
-class PrefServiceSimple;
+class PrefRegistrySimple;
 
 namespace chromeos {
 
@@ -30,7 +30,7 @@ class SessionLengthLimiter {
   };
 
   // Registers preferences.
-  static void RegisterPrefs(PrefServiceSimple* local_state);
+  static void RegisterPrefs(PrefRegistrySimple* local_state);
 
   SessionLengthLimiter(Delegate* delegate, bool browser_restarted);
   ~SessionLengthLimiter();