arc: kArcCompatibleFilesystemChosen pref to local state and integer.

chrome/browser/chromeos/arc/arc_session_manager.h

Index: chrome/browser/chromeos/arc/arc_session_manager.h
diff --git a/chrome/browser/chromeos/arc/arc_session_manager.h b/chrome/browser/chromeos/arc/arc_session_manager.h
index a9bf4f5e188b6e5bc026b322d814e1f020a89011..5029926363277202a421bd3ccb29d5478ee10c42 100644
--- a/chrome/browser/chromeos/arc/arc_session_manager.h
+++ b/chrome/browser/chromeos/arc/arc_session_manager.h
@@ -19,6 +19,7 @@
 #include "components/arc/arc_stop_reason.h"
 
 class ArcAppLauncher;
+class PrefRegistrySimple;
 class Profile;
 
 namespace user_prefs {
@@ -118,8 +119,9 @@ class ArcSessionManager : public ArcSessionRunner::Observer,
   // Exposed here for unit_tests validation.
   static bool IsOobeOptInActive();
 
-  // It is called from chrome/browser/prefs/browser_prefs.cc.
+  // Pref registration is called from chrome/browser/prefs/browser_prefs.cc.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+  static void RegisterLocalStatePrefs(PrefRegistrySimple* registry);
 
   static void DisableUIForTesting();
   static void EnableCheckAndroidManagementForTesting();