Revert of ash: Add checks for supervised users.

ash/system/chromeos/supervised/tray_supervised_user.h

Index: ash/system/chromeos/supervised/tray_supervised_user.h
diff --git a/ash/system/chromeos/supervised/tray_supervised_user.h b/ash/system/chromeos/supervised/tray_supervised_user.h
index 5d07d25feb4e5371546f4f861fb12d180bf955a6..dbad222ea57541e8fe39de1f4b63787116142598 100644
--- a/ash/system/chromeos/supervised/tray_supervised_user.h
+++ b/ash/system/chromeos/supervised/tray_supervised_user.h
@@ -15,7 +15,7 @@
 class SystemTray;
 
 class ASH_EXPORT TraySupervisedUser : public SystemTrayItem,
-                                      public ViewClickListener {
+                                          public ViewClickListener {
  public:
   explicit TraySupervisedUser(SystemTray* system_tray);
   virtual ~TraySupervisedUser();
@@ -43,9 +43,6 @@
   // Previous login status to avoid showing notification upon unlock.
   user::LoginStatus status_;
 
-  // Previous user supervised state to avoid showing notification upon unlock.
-  bool is_user_supervised_;
-
   DISALLOW_COPY_AND_ASSIGN(TraySupervisedUser);
 };