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

ash/system/tray/tray_empty.h

Index: ash/system/tray/tray_empty.h
diff --git a/ash/system/tray/tray_empty.h b/ash/system/tray/tray_empty.h
index 680012e852fbefcd4a741082e597650577b8a53f..f9bcc95d7fa697a588a23caa1f7b0b19f7996681 100644
--- a/ash/system/tray/tray_empty.h
+++ b/ash/system/tray/tray_empty.h
@@ -17,13 +17,13 @@ class TrayEmpty : public SystemTrayItem {
 
  private:
   // 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;
 
   DISALLOW_COPY_AND_ASSIGN(TrayEmpty);
 };