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

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index f0754e412806a1d08029831d2abe04c064256e18..8d4358d86ee83a8eab746698e60e966e2875ba48 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -287,14 +287,14 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
                                 const gfx::Insets& insets);
 
   // Called when the user logs in.
-  void OnLoginStateChanged(user::LoginStatus status);
+  void OnLoginStateChanged(LoginStatus status);
 
   // Called after the logged-in user's profile is ready.
   void OnLoginUserProfilePrepared();
 
   // Called when the login status changes.
   // TODO(oshima): Investigate if we can merge this and |OnLoginStateChanged|.
-  void UpdateAfterLoginStatusChange(user::LoginStatus status);
+  void UpdateAfterLoginStatusChange(LoginStatus status);
 
   // Called when the application is exiting.
   void OnAppTerminating();