Remove OS_CHROMEOS from ui/ash code

chrome/browser/ui/ash/multi_user/multi_user_context_menu.cc

Index: chrome/browser/ui/ash/multi_user/multi_user_context_menu.cc
diff --git a/chrome/browser/ui/ash/multi_user/multi_user_context_menu.cc b/chrome/browser/ui/ash/multi_user/multi_user_context_menu.cc
deleted file mode 100644
index 110a8cca17bcdbf097e6715b9856a9b5fea442ca..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/ash/multi_user/multi_user_context_menu.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/ui/ash/multi_user/multi_user_context_menu.h"
-
-#include "ui/base/models/menu_model.h"
-
-std::unique_ptr<ui::MenuModel> CreateMultiUserContextMenu(
-    aura::Window* window) {
-  std::unique_ptr<ui::MenuModel> menu_model;
-  return menu_model;
-}
-
-void ExecuteVisitDesktopCommand(int command_id, aura::Window* window) {}