Don't delete Primary root window and monitor

ash/monitor/multi_monitor_manager.h

 // Copyright (c) 2012 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 ASH_MONITOR_MULTI_MONITOR_MANAGER_H_
 #define ASH_MONITOR_MULTI_MONITOR_MANAGER_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
@@ skipping 47 matching lines @@
 
  private:
   typedef std::vector<aura::Monitor*> Monitors;
 
   void Init();
   void AddRemoveMonitorImpl();
   void CycleMonitorImpl();
 
   Monitors monitors_;
 
+  // We keep the primary root window so that when # of montor goes zero,
+  // we don't delete it.
+  aura::RootWindow* primary_root_window_;

[Daniel Erat, 2012/03/23 23:49:48]

nit: you're not using this, are you?

[oshima, 2012/03/24 00:17:50]

This file was supposed to be reverted, my bad. Done

+
   DISALLOW_COPY_AND_ASSIGN(MultiMonitorManager);
 };
 
 extern const aura::WindowProperty<aura::Monitor*>* const kMonitorKey;
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  //  ASH_MONITOR_MULTI_MONITOR_MANAGER_H_