Convert //ash from scoped_ptr to std::unique_ptr

ash/test/task_switch_time_tracker_test_api.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_TEST_TASK_SWITCH_TIME_TRACKER_TEST_API_H_
 #define ASH_TEST_TASK_SWITCH_TIME_TRACKER_TEST_API_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 namespace base {
 class SimpleTestTickClock;
 }  // namespace base
 
 namespace ash {
 
 class TaskSwitchTimeTracker;
 
@@ skipping 14 matching lines @@
   void Advance(base::TimeDelta time_delta);
 
   // Wrapper function to access TaskSwitchTimeTracker::HasLastActionTime();
   bool HasLastActionTime() const;
 
  private:
   // Owned by |time_tracker_|.
   base::SimpleTestTickClock* tick_clock_;
 
   // The TaskSwitchTimeTracker to provide internal access to.
-  scoped_ptr<TaskSwitchTimeTracker> time_tracker_;
+  std::unique_ptr<TaskSwitchTimeTracker> time_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskSwitchTimeTrackerTestAPI);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TASK_SWITCH_TIME_TRACKER_TEST_API_H_