Change base::TickClock to a ref counted class.

ash/wm/maximize_mode/maximize_mode_controller.h

 // 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_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_CONTROLLER_H_
 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_CONTROLLER_H_
 
 #include "ash/accelerometer/accelerometer_observer.h"
 #include "ash/ash_export.h"
 #include "ash/display/display_controller.h"
@@ skipping 117 matching lines @@
   virtual void SuspendDone(const base::TimeDelta& sleep_duration) override;
 #endif  // OS_CHROMEOS
 
  private:
   friend class MaximizeModeControllerTest;
   friend class MaximizeModeWindowManagerTest;
   friend class test::MultiUserWindowManagerChromeOSTest;
 
   // Set the TickClock. This is only to be used by tests that need to
   // artificially and deterministically control the current time.
-  void SetTickClockForTest(scoped_ptr<base::TickClock> tick_clock);
+  void SetTickClockForTest(const scoped_refptr<base::TickClock>& tick_clock);
 
   // Detect hinge rotation from |base| and |lid| accelerometers and
   // automatically start / stop maximize mode.
   void HandleHingeRotation(const gfx::Vector3dF& base,
                            const gfx::Vector3dF& lid);
 
   // Detect screen rotation from |lid| accelerometer and automatically rotate
   // screen.
   void HandleScreenRotation(const gfx::Vector3dF& lid);
 
@@ skipping 57 matching lines @@
   base::Time last_touchview_transition_time_;
   base::TimeDelta total_touchview_time_;
   base::TimeDelta total_non_touchview_time_;
 
   // Tracks the last time we received a lid open event. This is used to suppress
   // erroneous accelerometer readings as the lid is opened but the accelerometer
   // reports readings that make the lid to appear near fully open.
   base::TimeTicks last_lid_open_time_;
 
   // Source for the current time in base::TimeTicks.
-  scoped_ptr<base::TickClock> tick_clock_;
+  scoped_refptr<base::TickClock> tick_clock_;
 
   // Tracks when the lid is closed. Used to prevent entering maximize mode.
   bool lid_is_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(MaximizeModeController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_CONTROLLER_H_