Moves maintaining root_window_for_new_windows_ to Shell

chrome/browser/chromeos/ui/idle_app_name_notification_view.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 "chrome/browser/chromeos/ui/idle_app_name_notification_view.h"
 
 #include <string>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
@@ skipping 36 matching lines @@
 
 // Color of the window background.
 const SkColor kWindowBackgroundColor = SK_ColorWHITE;
 
 // Radius of the rounded corners of the window.
 const int kWindowCornerRadius = 4;
 
 // Creates and shows the message widget for |view| with |animation_time_ms|.
 void CreateAndShowWidget(views::WidgetDelegateView* delegate,
                          int animation_time_ms) {
-  aura::Window* root_window = ash::Shell::GetTargetRootWindow();
+  aura::Window* root_window = ash::Shell::GetRootWindowForNewWindows();
   gfx::Size rs = root_window->bounds().size();
   gfx::Size ps = delegate->GetPreferredSize();
   gfx::Rect bounds((rs.width() - ps.width()) / 2,
                    -ps.height(),
                    ps.width(),
                    ps.height());
   views::Widget::InitParams params;
   params.type = views::Widget::InitParams::TYPE_POPUP;
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   params.ownership = views::Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET;
@@ skipping 194 matching lines @@
 
   view_ = new IdleAppNameNotificationDelegateView(
       this,
       app_name,
       error,
       message_visibility_time_in_ms + animation_time_ms);
   CreateAndShowWidget(view_, animation_time_ms);
 }
 
 }  // namespace chromeos