Convert //ash from scoped_ptr to std::unique_ptr

ash/metrics/task_switch_time_tracker.h

 // Copyright 2015 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_METRICS_TASK_SWITCH_TIME_TRACKER_H_
 #define ASH_METRICS_TASK_SWITCH_TIME_TRACKER_H_
 
+#include <memory>
 #include <string>
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 namespace base {
 class HistogramBase;
 class TickClock;
 }
 
 namespace ash {
 
 namespace test {
@@ skipping 12 matching lines @@
   // Notifies |this| that a task switch has occurred. A histogram data point
   // will be recorded for all calls but the first.
   void OnTaskSwitch();
 
  private:
   friend class test::TaskSwitchTimeTrackerTestAPI;
 
   // Private constructor that the test::TaskSwitchTimeTrackerTestAPI can use to
   // inject a custom |tick_clock|.
   TaskSwitchTimeTracker(const std::string& histogram_name,
-                        scoped_ptr<base::TickClock> tick_clock);
+                        std::unique_ptr<base::TickClock> tick_clock);
 
   // Returns true if |last_action_time_| has a valid value.
   bool HasLastActionTime() const;
 
   // Sets the |last_action_time_| to |tick_clock_|'s current value and returns
   // the previous value for |last_action_time_|.
   base::TimeTicks SetLastActionTime();
 
   // Records a data point in the histogram.
   void RecordTimeDelta();
 
   // Lazily obtains and sets the |histogram_|.
   base::HistogramBase* GetHistogram();
 
   // The histogram name to record data to.
   std::string histogram_name_;
 
   // The histogram to log data to. Set via GetHistogram() using lazy load.
   base::HistogramBase* histogram_ = nullptr;
 
   // Tracks the last time OnTaskSwitch() was called. A value of
   // base::TimeTicks() should be interpreted as not set.
   base::TimeTicks last_action_time_ = base::TimeTicks();
 
   // The clock used to determine the |last_action_time_|.
-  scoped_ptr<base::TickClock> tick_clock_;
+  std::unique_ptr<base::TickClock> tick_clock_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskSwitchTimeTracker);
 };
 
 }  // namespace ash
 
 #endif  // ASH_METRICS_TASK_SWITCH_TIME_TRACKE_H_