Move DisplayManager and DisplayChangeObserverX11 from aura to ash.

ash/root_window_controller_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/root_window_controller.h"
 
 #include "ash/display/display_controller.h"
-#include "ash/display/multi_display_manager.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/system_modal_container_layout_manager.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/env.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
@@ skipping 291 matching lines @@
   views::Widget* session_modal_widget =
         CreateModalWidget(gfx::Rect(300, 10, 100, 100));
   EXPECT_EQ(Shell::GetContainer(controller->root_window(),
       internal::kShellWindowId_SystemModalContainer)->layout_manager(),
           controller->GetSystemModalLayoutManager(
               session_modal_widget->GetNativeView()));
 }
 
 }  // namespace test
 }  // namespace ash