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 5816ff1276be39a041aaba325afd827878c8dd48..54bd87089e93d9cf76a6c154d477a0851321b78b 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -286,14 +286,14 @@ 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();