Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/profiles/profile_info_cache.h

Index: chrome/browser/profiles/profile_info_cache.h
diff --git a/chrome/browser/profiles/profile_info_cache.h b/chrome/browser/profiles/profile_info_cache.h
index 60f939a42b7a839fb088d634ee26ceaf1a66225f..4266545bdbd5e6feb86db5d605d89c5059bcf1d8 100644
--- a/chrome/browser/profiles/profile_info_cache.h
+++ b/chrome/browser/profiles/profile_info_cache.h
@@ -27,6 +27,7 @@ class DictionaryValue;
 }
 
 class PrefService;
+class PrefServiceSimple;
 
 // This class saves various information about profiles to local preferences.
 // This cache can be used to display a list of profiles without having to
@@ -124,7 +125,7 @@ class ProfileInfoCache : public ProfileInfoInterface,
   static std::vector<string16> GetProfileNames();
 
   // Register cache related preferences in Local State.
-  static void RegisterPrefs(PrefService* prefs);
+  static void RegisterPrefs(PrefServiceSimple* prefs);
 
   void AddObserver(ProfileInfoCacheObserver* obs);
   void RemoveObserver(ProfileInfoCacheObserver* obs);