Revert "chromeos: Move files in //ash/common to //ash, part 1"

ash/system/date/tray_system_info.h

Index: ash/system/date/tray_system_info.h
diff --git a/ash/system/date/tray_system_info.h b/ash/system/date/tray_system_info.h
deleted file mode 100644
index 6132b7f5a6be80286165dd84221e00129fb196e1..0000000000000000000000000000000000000000
--- a/ash/system/date/tray_system_info.h
+++ /dev/null
@@ -1,67 +0,0 @@
-// Copyright 2016 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_SYSTEM_INFO_H_
-#define ASH_SYSTEM_DATE_TRAY_SYSTEM_INFO_H_
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "ash/common/login_status.h"
-#include "ash/system/date/clock_observer.h"
-#include "ash/system/tray/system_tray_item.h"
-#include "base/macros.h"
-
-namespace views {
-class Label;
-}
-
-namespace ash {
-class SystemClockObserver;
-class SystemInfoDefaultView;
-
-namespace tray {
-class TimeView;
-}
-
-// The bottom row of the system menu. The default view shows the current date
-// and power status. The tray view shows the current time.
-class ASH_EXPORT TraySystemInfo : public SystemTrayItem, public ClockObserver {
- public:
-  explicit TraySystemInfo(SystemTray* system_tray);
-  ~TraySystemInfo() override;
-
-  const tray::TimeView* GetTimeTrayForTesting() const;
-  const SystemInfoDefaultView* GetDefaultViewForTesting() const;
-  views::View* CreateDefaultViewForTesting(LoginStatus status);
-
- private:
-  // SystemTrayItem:
-  views::View* CreateTrayView(LoginStatus status) override;
-  views::View* CreateDefaultView(LoginStatus status) override;
-  void DestroyTrayView() override;
-  void DestroyDefaultView() override;
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override;
-
-  // ClockObserver:
-  void OnDateFormatChanged() override;
-  void OnSystemClockTimeUpdated() override;
-  void OnSystemClockCanSetTimeChanged(bool can_set_time) override;
-  void Refresh() override;
-
-  void SetupLabelForTimeTray(views::Label* label);
-  void UpdateTimeFormat();
-
-  tray::TimeView* tray_view_;
-  SystemInfoDefaultView* default_view_;
-  LoginStatus login_status_;
-
-  std::unique_ptr<SystemClockObserver> system_clock_observer_;
-
-  DISALLOW_COPY_AND_ASSIGN(TraySystemInfo);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_DATE_TRAY_SYSTEM_INFO_H_