Move demo mode preference registration.

chrome/browser/ui/webui/chromeos/login/demo_mode_detector.h

Index: chrome/browser/ui/webui/chromeos/login/demo_mode_detector.h
diff --git a/chrome/browser/ui/webui/chromeos/login/demo_mode_detector.h b/chrome/browser/ui/webui/chromeos/login/demo_mode_detector.h
index b489e36f968ec5010cc8da0722b68b5cfb563129..8c27c0e90fc52111bf55decc0303eb4317492cfc 100644
--- a/chrome/browser/ui/webui/chromeos/login/demo_mode_detector.h
+++ b/chrome/browser/ui/webui/chromeos/login/demo_mode_detector.h
@@ -12,6 +12,8 @@
 #include "base/timer/timer.h"
 #include "chrome/browser/chromeos/idle_detector.h"
 
+class PrefRegistrySimple;
+
 namespace chromeos {
 
 // Helper for idle state and demo-mode detection.
@@ -24,6 +26,9 @@ class DemoModeDetector {
   void InitDetection();
   void StopDetection();
 
+  // Registers the preference for derelict state.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
  private:
   void StartIdleDetection();
   void StartOobeTimer();