Use MD-ash's auto hide behavior for arc++ windows.

ash/system/web_notification/web_notification_tray_unittest.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/common/system/web_notification/web_notification_tray.h"
 
 #include <utility>
 #include <vector>
 
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 402 matching lines @@
   EXPECT_EQ(SHELF_AUTO_HIDE_HIDDEN, shelf->GetAutoHideState());
   int bottom_auto_hidden = GetPopupWorkAreaBottom();
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_NEVER);
 
   // Put |widget| into fullscreen without forcing the shelf to hide. Currently,
   // this is used by immersive fullscreen and forces the shelf to be auto
   // hidden.
   WmLookup::Get()
       ->GetWindowForWidget(widget.get())
       ->GetWindowState()
-      ->set_hide_shelf_when_fullscreen(false);
+      ->set_shelf_mode_in_fullscreen(
+          ash::wm::WindowState::SHELF_AUTO_HIDE_VISIBLE);
   widget->SetFullscreen(true);
   RunAllPendingInMessageLoop();
 
   // The work area for auto-hidden status of fullscreen is a bit larger
   // since it doesn't even have the 3-pixel width.
   EXPECT_EQ(SHELF_AUTO_HIDE_HIDDEN, shelf->GetAutoHideState());
   int bottom_fullscreen_hidden = GetPopupWorkAreaBottom();
   EXPECT_EQ(bottom_auto_hidden, bottom_fullscreen_hidden);
 
   // Move the mouse cursor at the bottom, which shows the shelf.
@@ skipping 88 matching lines @@
       ui::ET_TOUCH_RELEASED, out_of_bounds, touch_id,
       move.time_stamp() + base::TimeDelta::FromMilliseconds(50));
   generator.Dispatch(&release);
   EXPECT_FALSE(tray->draw_background_as_active());
   EXPECT_FALSE(tray->IsMessageCenterBubbleVisible());
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace ash