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

ash/system/session/tray_session_length_limit.h

Index: ash/system/session/tray_session_length_limit.h
diff --git a/ash/system/session/tray_session_length_limit.h b/ash/system/session/tray_session_length_limit.h
deleted file mode 100644
index fef3b4f06a043b5a2ae78917889bd357fb382bdc..0000000000000000000000000000000000000000
--- a/ash/system/session/tray_session_length_limit.h
+++ /dev/null
@@ -1,75 +0,0 @@
-// Copyright 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 ASH_SYSTEM_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_
-#define ASH_SYSTEM_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_
-
-#include <memory>
-
-#include "ash/system/session/session_length_limit_observer.h"
-#include "ash/system/tray/system_tray_item.h"
-#include "base/macros.h"
-#include "base/strings/string16.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-
-namespace ash {
-namespace test {
-class TraySessionLengthLimitTest;
-}
-
-class LabelTrayView;
-
-// Adds a countdown timer to the system tray if the session length is limited.
-class ASH_EXPORT TraySessionLengthLimit : public SystemTrayItem,
-                                          public SessionLengthLimitObserver {
- public:
-  enum LimitState { LIMIT_NONE, LIMIT_SET, LIMIT_EXPIRING_SOON };
-
-  explicit TraySessionLengthLimit(SystemTray* system_tray);
-  ~TraySessionLengthLimit() override;
-
-  // SystemTrayItem:
-  views::View* CreateDefaultView(LoginStatus status) override;
-  void DestroyDefaultView() override;
-
-  // SessionLengthLimitObserver:
-  void OnSessionStartTimeChanged() override;
-  void OnSessionLengthLimitChanged() override;
-
- private:
-  friend class test::TraySessionLengthLimitTest;
-
-  static const char kNotificationId[];
-
-  // Update state, notification and tray bubble view.  Called by the
-  // RepeatingTimer in regular intervals and also by OnSession*Changed().
-  void Update();
-
-  // Recalculate |limit_state_| and |remaining_session_time_|.
-  void UpdateState();
-
-  void UpdateNotification();
-  void UpdateTrayBubbleView() const;
-
-  // These require that the state has been updated before.
-  base::string16 ComposeNotificationMessage() const;
-  base::string16 ComposeTrayBubbleMessage() const;
-
-  base::TimeTicks session_start_time_;
-  base::TimeDelta time_limit_;
-  base::TimeDelta remaining_session_time_;
-
-  LimitState limit_state_;       // Current state.
-  LimitState last_limit_state_;  // State of last notification update.
-
-  LabelTrayView* tray_bubble_view_;
-  std::unique_ptr<base::RepeatingTimer> timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(TraySessionLengthLimit);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_SESSION_TRAY_SESSION_LENGTH_LIMIT_H_