Convert //ash from scoped_ptr to std::unique_ptr

ash/first_run/first_run_helper_unittest.cc

 // Copyright 2013 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/first_run/first_run_helper.h"
 
 #include "ash/first_run/desktop_cleaner.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/ash_test_base.h"
@@ skipping 88 matching lines @@
   }
 
   FirstRunHelper* helper() { return helper_.get(); }
 
   int cancelled_times() const { return cancelled_times_; }
 
  private:
   // FirstRunHelper::Observer overrides.
   void OnCancelled() override { ++cancelled_times_; }
 
-  scoped_ptr<FirstRunHelper> helper_;
+  std::unique_ptr<FirstRunHelper> helper_;
   int cancelled_times_;
 
   DISALLOW_COPY_AND_ASSIGN(FirstRunHelperTest);
 };
 
 // This test creates helper, checks that containers are hidden and then
 // destructs helper.
 TEST_F(FirstRunHelperTest, ContainersAreHidden) {
   CheckContainersAreHidden();
 }
@@ skipping 17 matching lines @@
   CountingEventHandler handler(&mouse_events);
   overlay_window->AddPreTargetHandler(&handler);
   GetEventGenerator().PressLeftButton();
   GetEventGenerator().ReleaseLeftButton();
   EXPECT_EQ(mouse_events, 2);
   overlay_window->RemovePreTargetHandler(&handler);
 }
 
 }  // namespace test
 }  // namespace ash