Convert //ash from scoped_ptr to std::unique_ptr

ash/test/shelf_button_pressed_metric_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_SHELF_BUTTON_PRESSED_METRIC_TRACKER_TEST_API_H_
 #define ASH_TEST_SHELF_BUTTON_PRESSED_METRIC_TRACKER_TEST_API_H_
 
 #include "ash/shelf/shelf_button_pressed_metric_tracker.h"
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/events/event.h"
 
 namespace base {
 class TickClock;
 }  // namespace base
 
 namespace ash {
 namespace test {
 
 class ShelfButtonPressedMetricTrackerTestAPI {
  public:
   explicit ShelfButtonPressedMetricTrackerTestAPI(
       ShelfButtonPressedMetricTracker* shelf_button_pressed_metric_tracker);
   ~ShelfButtonPressedMetricTrackerTestAPI();
 
   // Set's the |tick_clock_| on the internal ShelfButtonPressedMetricTracker.
-  void SetTickClock(scoped_ptr<base::TickClock> tick_clock);
+  void SetTickClock(std::unique_ptr<base::TickClock> tick_clock);
 
  private:
   ShelfButtonPressedMetricTracker* shelf_button_pressed_metric_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfButtonPressedMetricTrackerTestAPI);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_SHELF_BUTTON_PRESSED_METRIC_TRACKER_TEST_API _H_