Moves maintaining root_window_for_new_windows_ to Shell

components/exo/wm_helper_ash.cc

 // Copyright 2016 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 "components/exo/wm_helper_ash.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
@@ skipping 35 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // WMHelperAsh, private:
 
 const display::ManagedDisplayInfo WMHelperAsh::GetDisplayInfo(
     int64_t display_id) const {
   return ash::Shell::GetInstance()->display_manager()->GetDisplayInfo(
       display_id);
 }
 
 aura::Window* WMHelperAsh::GetContainer(int container_id) {
-  return ash::Shell::GetContainer(ash::Shell::GetTargetRootWindow(),
+  return ash::Shell::GetContainer(ash::Shell::GetRootWindowForNewWindows(),
                                   container_id);
 }
 
 aura::Window* WMHelperAsh::GetActiveWindow() const {
   return ash::Shell::GetInstance()->activation_client()->GetActiveWindow();
 }
 
 aura::Window* WMHelperAsh::GetFocusedWindow() const {
   aura::client::FocusClient* focus_client =
       aura::client::GetFocusClient(ash::Shell::GetPrimaryRootWindow());
@@ skipping 75 matching lines @@
 
 void WMHelperAsh::OnMaximizeModeEnded() {
   NotifyMaximizeModeEnded();
 }
 
 void WMHelperAsh::OnKeyboardDeviceConfigurationChanged() {
   NotifyKeyboardDeviceConfigurationChanged();
 }
 
 }  // namespace exo