Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/extensions/api/commands/command_service.h

Index: chrome/browser/extensions/api/commands/command_service.h
diff --git a/chrome/browser/extensions/api/commands/command_service.h b/chrome/browser/extensions/api/commands/command_service.h
index 8d0e70fdd779a516257ec72e0c49ceed434b464b..ce3ba5a7b78eac3380caff12fd4bfbca555dc2d0 100644
--- a/chrome/browser/extensions/api/commands/command_service.h
+++ b/chrome/browser/extensions/api/commands/command_service.h
@@ -16,7 +16,7 @@
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_source.h"
 
-class PrefService;
+class PrefServiceSyncable;
 class Profile;
 
 namespace base {
@@ -43,7 +43,7 @@ class CommandService : public ProfileKeyedService,
   };
 
   // Register prefs for keybinding.
-  static void RegisterUserPrefs(PrefService* user_prefs);
+  static void RegisterUserPrefs(PrefServiceSyncable* user_prefs);
 
   // Constructs a CommandService object for the given profile.
   explicit CommandService(Profile* profile);