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

chrome/browser/ui/ash/accelerator_commands_browsertest.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/common/accelerators/accelerator_commands.h"
 
 #include "ash/accelerators/accelerator_commands_aura.h"
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/ash_switches.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 34 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MaximizableWidgetDelegate);
 };
 
 // Returns true if |window_state|'s window is in immersive fullscreen. Infer
 // whether the window is in immersive fullscreen based on whether the shelf is
 // hidden when the window is fullscreen. (This is not quite right because the
 // shelf is hidden if a window is in both immersive fullscreen and tab
 // fullscreen.)
 bool IsInImmersiveFullscreen(ash::wm::WindowState* window_state) {
   return window_state->IsFullscreen() &&
-      !window_state->hide_shelf_when_fullscreen();
+         (window_state->shelf_mode_in_fullscreen() !=
+          ash::wm::WindowState::SHELF_HIDDEN);
 }
 
 }  // namespace
 
 typedef InProcessBrowserTest AcceleratorCommandsBrowserTest;
 
 // Confirm that toggling window miximized works properly
 IN_PROC_BROWSER_TEST_F(AcceleratorCommandsBrowserTest, ToggleMaximized) {
   ASSERT_TRUE(ash::Shell::HasInstance()) << "No Instance";
   ash::wm::WindowState* window_state = ash::wm::GetActiveWindowState();
@@ skipping 241 matching lines @@
     CloseAppWindow(app_window);
   }
 }
 
 INSTANTIATE_TEST_CASE_P(InitiallyRestored,
                         AcceleratorCommandsPlatformAppFullscreenBrowserTest,
                         Values(ui::SHOW_STATE_NORMAL));
 INSTANTIATE_TEST_CASE_P(InitiallyMaximized,
                         AcceleratorCommandsPlatformAppFullscreenBrowserTest,
                         Values(ui::SHOW_STATE_MAXIMIZED));