Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/password_manager/password_store_x.h

Index: chrome/browser/password_manager/password_store_x.h
diff --git a/chrome/browser/password_manager/password_store_x.h b/chrome/browser/password_manager/password_store_x.h
index ab69ca7303a270126f75db45bed13772df41d7c2..4a25ae95a0d7127ce68b3522f86d8552592f9be0 100644
--- a/chrome/browser/password_manager/password_store_x.h
+++ b/chrome/browser/password_manager/password_store_x.h
@@ -13,6 +13,7 @@
 
 class LoginDatabase;
 class PrefService;
+class PrefServiceSyncable;
 class Profile;
 
 // PasswordStoreX is used on Linux and other non-Windows, non-Mac OS X
@@ -56,7 +57,7 @@ class PasswordStoreX : public PasswordStoreDefault {
 
 #if !defined(OS_MACOSX) && !defined(OS_CHROMEOS) && defined(OS_POSIX)
   // Registers the pref setting used for the methods below.
-  static void RegisterUserPrefs(PrefService* prefs);
+  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
 
   // Returns true if passwords have been tagged with the local profile id.
   static bool PasswordsUseLocalProfileId(PrefService* prefs);