Convert //ash from scoped_ptr to std::unique_ptr

ash/test/display_manager_test_api.cc

 // Copyright (c) 2012 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/test/display_manager_test_api.h"
 
 #include <cstdarg>
 #include <vector>
 
 #include "ash/ash_switches.h"
@@ skipping 153 matching lines @@
   return display_manager->SetDisplayMode(display_id, mode);
 }
 
 void SwapPrimaryDisplay() {
   if (gfx::Screen::GetScreen()->GetNumDisplays() <= 1)
     return;
   Shell::GetInstance()->window_tree_host_manager()->SetPrimaryDisplayId(
       ScreenUtil::GetSecondaryDisplay().id());
 }
 
-scoped_ptr<display::DisplayLayout> CreateDisplayLayout(
+std::unique_ptr<display::DisplayLayout> CreateDisplayLayout(
     display::DisplayPlacement::Position position,
     int offset) {
   DisplayManager* display_manager = Shell::GetInstance()->display_manager();
   display::DisplayIdList list = display_manager->GetCurrentDisplayIdList();
 
   display::DisplayLayoutBuilder builder(
       gfx::Screen::GetScreen()->GetPrimaryDisplay().id());
   builder.SetSecondaryPlacement(ScreenUtil::GetSecondaryDisplay().id(),
                                 position, offset);
   return builder.Build();
@@ skipping 14 matching lines @@
   for (size_t i = 0; i < count; i++) {
     int64_t id = va_arg(args, int64_t);
     list.push_back(id);
   }
   SortDisplayIdList(&list);
   return list;
 }
 
 }  // namespace test
 }  // namespace ash