Convert //ash from scoped_ptr to std::unique_ptr

ash/metrics/task_switch_time_tracker_unittest.cc

 // 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.
 
 #include "ash/metrics/task_switch_time_tracker.h"
 
 #include <string>
 
 #include "ash/test/task_switch_time_tracker_test_api.h"
 #include "base/test/histogram_tester.h"
@@ skipping 19 matching lines @@
 
   // Wrapper to the test targets OnTaskSwitch() method.
   void OnTaskSwitch();
 
   TaskSwitchTimeTracker* time_tracker() {
     return time_tracker_test_api_->time_tracker();
   }
 
  protected:
   // Used to verify recorded histogram data.
-  scoped_ptr<base::HistogramTester> histogram_tester_;
+  std::unique_ptr<base::HistogramTester> histogram_tester_;
 
   // A Test API that wraps the test target.
-  scoped_ptr<test::TaskSwitchTimeTrackerTestAPI> time_tracker_test_api_;
+  std::unique_ptr<test::TaskSwitchTimeTrackerTestAPI> time_tracker_test_api_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TaskSwitchTimeTrackerTest);
 };
 
 TaskSwitchTimeTrackerTest::TaskSwitchTimeTrackerTest() {
 }
 
 TaskSwitchTimeTrackerTest::~TaskSwitchTimeTrackerTest() {
 }
@@ skipping 44 matching lines @@
   histogram_tester_->ExpectTotalCount(kHistogramName, 1);
   histogram_tester_->ExpectBucketCount(kHistogramName, 0, 1);
 
   time_tracker_test_api_->Advance(base::TimeDelta::FromSeconds(1));
   OnTaskSwitch();
   histogram_tester_->ExpectTotalCount(kHistogramName, 2);
   histogram_tester_->ExpectBucketCount(kHistogramName, 1, 1);
 }
 
 }  // namespace ash