Add unittests for X11TopmostWindowFinder

ui/base/x/x11_menu_list.h

 // Copyright (c) 2014 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.
 
 #ifndef UI_BASE_X_X11_MENU_LIST_H_
 #define UI_BASE_X_X11_MENU_LIST_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "ui/base/ui_base_export.h"
 #include "ui/gfx/x/x11_types.h"
 
-typedef unsigned long Atom;
-
 // A process wide singleton cache for X menus.
 template <typename T> struct DefaultSingletonTraits;
 
 namespace ui {
 
 // Keeps track of created and destroyed top level menu windows.
 class UI_BASE_EXPORT XMenuList {
  public:
   static XMenuList* GetInstance();
 
@@ skipping 13 matching lines @@
   ~XMenuList();
 
   std::vector<XID> menus_;
   ::Atom menu_type_atom_;
   DISALLOW_COPY_AND_ASSIGN(XMenuList);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_X_X11_MENU_LIST_H_