Don't delete Primary root window and monitor

ash/monitor/multi_monitor_manager.h

Index: ash/monitor/multi_monitor_manager.h
diff --git a/ash/monitor/multi_monitor_manager.h b/ash/monitor/multi_monitor_manager.h
index b24c98eb86819510c2c5f6e753d406ea46f0a013..4a2b7d985b072034feb3d8f8b9a3c89f5be2fadf 100644
--- a/ash/monitor/multi_monitor_manager.h
+++ b/ash/monitor/multi_monitor_manager.h
@@ -65,6 +65,10 @@ class ASH_EXPORT MultiMonitorManager : public aura::MonitorManager,
 
   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);
 };