Revert 165244 - Create ash memory monitor

ash/system/monitor/tray_monitor.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_SYSTEM_DATE_TRAY_MONITOR_H_
-#define ASH_SYSTEM_DATE_TRAY_MONITOR_H_
-
-#include "ash/system/tray/system_tray_item.h"
-#include "base/timer.h"
-
-namespace views {
-class Label;
-}
-
-namespace ash {
-namespace internal {
-
-class TrayMonitor : public SystemTrayItem {
- public:
-  TrayMonitor();
-  virtual ~TrayMonitor();
-
- private:
-  // Overridden from SystemTrayItem.
-  virtual views::View* CreateTrayView(user::LoginStatus status) OVERRIDE;
-  virtual void DestroyTrayView() OVERRIDE;
-
-  void RefreshStats();
-
-  views::Label* label_;
-  base::RepeatingTimer<TrayMonitor> refresh_timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayMonitor);
-};
-
-}  // namespace internal
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_DATE_TRAY_MONITOR_H_