Moves ash::user::LoginStatus to ash/common

ash/system/chromeos/brightness/tray_brightness.h

Index: ash/system/chromeos/brightness/tray_brightness.h
diff --git a/ash/system/chromeos/brightness/tray_brightness.h b/ash/system/chromeos/brightness/tray_brightness.h
index dd05b99b89fdb4a76eb4fa8413c46a2e92d9da6e..6e6c56e4ff945c35bb76a8c4ceee842acf0e493e 100644
--- a/ash/system/chromeos/brightness/tray_brightness.h
+++ b/ash/system/chromeos/brightness/tray_brightness.h
@@ -36,13 +36,13 @@ class ASH_EXPORT TrayBrightness
   void HandleInitialBrightness(double percent);
 
   // Overridden from SystemTrayItem.
-  views::View* CreateTrayView(user::LoginStatus status) override;
-  views::View* CreateDefaultView(user::LoginStatus status) override;
-  views::View* CreateDetailedView(user::LoginStatus status) override;
+  views::View* CreateTrayView(LoginStatus status) override;
+  views::View* CreateDefaultView(LoginStatus status) override;
+  views::View* CreateDetailedView(LoginStatus status) override;
   void DestroyTrayView() override;
   void DestroyDefaultView() override;
   void DestroyDetailedView() override;
-  void UpdateAfterLoginStatusChange(user::LoginStatus status) override;
+  void UpdateAfterLoginStatusChange(LoginStatus status) override;
   bool ShouldHideArrow() const override;
   bool ShouldShowShelf() const override;