Moves maintaining root_window_for_new_windows_ to Shell

ash/common/wm/window_cycle_list.cc

 // Copyright 2014 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/wm/window_cycle_list.h"
 
 #include <list>
 #include <map>
 
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
+#include "ash/shell.h"
 #include "base/command_line.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/layout/box_layout.h"
@@ skipping 499 matching lines @@
 
   views::Widget* widget = new views::Widget;
   views::Widget::InitParams params;
   params.delegate = cycle_view_;
   params.type = views::Widget::InitParams::TYPE_WINDOW_FRAMELESS;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   params.accept_events = true;
   params.name = "WindowCycleList (Alt+Tab)";
   // TODO(estade): make sure nothing untoward happens when the lock screen
   // or a system modal dialog is shown.
-  WmWindow* root_window = WmShell::Get()->GetRootWindowForNewWindows();
+  WmWindow* root_window = Shell::GetWmRootWindowForNewWindows();
   root_window->GetRootWindowController()->ConfigureWidgetInitParamsForContainer(
       widget, kShellWindowId_OverlayContainer, &params);
   gfx::Rect widget_rect = root_window->GetDisplayNearestWindow().bounds();
   const int widget_height = cycle_view_->GetPreferredSize().height();
   widget_rect.set_y(widget_rect.y() +
                     (widget_rect.height() - widget_height) / 2);
   widget_rect.set_height(widget_height);
   params.bounds = widget_rect;
   widget->Init(params);
 
   screen_observer_.Add(display::Screen::GetScreen());
   widget->Show();
   cycle_ui_widget_ = widget;
 }
 
 }  // namespace ash