Convert //ash from scoped_ptr to std::unique_ptr

ash/system/toast/toast_manager_unittest.cc

 // Copyright 2016 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/display/display_manager.h"
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/system/toast/toast_manager.h"
@@ skipping 135 matching lines @@
     // doesn't return correct value.
     gfx::Rect shelf_bounds = shelf->GetIdealBounds();
     EXPECT_FALSE(toast_bounds.Intersects(shelf_bounds));
     EXPECT_EQ(shelf_bounds.y() - 5, toast_bounds.bottom());
     EXPECT_EQ(root_bounds.bottom() - shelf_bounds.height() - 5,
               toast_bounds.bottom());
   }
 }
 
 TEST_F(ToastManagerTest, PositionWithAutoHiddenBottomShelf) {
-  scoped_ptr<aura::Window> window(
+  std::unique_ptr<aura::Window> window(
       CreateTestWindowInShellWithBounds(gfx::Rect(1, 2, 3, 4)));
 
   ShelfLayoutManager* shelf =
       Shelf::ForPrimaryDisplay()->shelf_layout_manager();
   SetShelfAlignment(ash::SHELF_ALIGNMENT_BOTTOM);
   SetShelfAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS);
   shelf->LayoutShelf();
   EXPECT_EQ(SHELF_AUTO_HIDE_HIDDEN, shelf->auto_hide_state());
 
   manager()->Show("DUMMY", kLongLongDuration /* prevent timeout */);
@@ skipping 88 matching lines @@
     // doesn't return correct value.
     gfx::Rect shelf_bounds = shelf->GetIdealBounds();
     EXPECT_FALSE(toast_bounds.Intersects(shelf_bounds));
     EXPECT_EQ(shelf_bounds.y() - 5, toast_bounds.bottom());
     EXPECT_EQ(root_bounds.bottom() - shelf_bounds.height() - 5,
               toast_bounds.bottom());
   }
 }
 
 }  // namespace ash