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

ash/system/overview/overview_button_tray.h

Index: ash/system/overview/overview_button_tray.h
diff --git a/ash/system/overview/overview_button_tray.h b/ash/system/overview/overview_button_tray.h
index 244617c6f022f8cd160357514b77c8b8cca6e766..087292d090a34dae647558ffdf4ff3c2836f3cf9 100644
--- a/ash/system/overview/overview_button_tray.h
+++ b/ash/system/overview/overview_button_tray.h
@@ -31,7 +31,7 @@ class ASH_EXPORT OverviewButtonTray : public TrayBackgroundView,
 
   // Updates the tray's visibility based on the LoginStatus and the current
   // state of MaximizeMode
-  virtual void UpdateAfterLoginStatusChange(user::LoginStatus status);
+  virtual void UpdateAfterLoginStatusChange(LoginStatus status);
 
   // ActionableView:
   bool PerformAction(const ui::Event& event) override;