mash: Migrate ShellDelegate ownership and access to WmShell.

chrome/browser/chromeos/display/display_configuration_observer.cc

 // Copyright (c) 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 "chrome/browser/chromeos/display/display_configuration_observer.h"
 
+#include "ash/common/shell_delegate.h"
+#include "ash/common/wm_shell.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/shell.h"
-#include "ash/shell_delegate.h"
 #include "chrome/browser/chromeos/display/display_preferences.h"
 
 namespace chromeos {
 
 DisplayConfigurationObserver::DisplayConfigurationObserver() {
   ash::Shell::GetInstance()->window_tree_host_manager()->AddObserver(this);
 }
 
 DisplayConfigurationObserver::~DisplayConfigurationObserver() {
   ash::Shell::GetInstance()->window_tree_host_manager()->RemoveObserver(this);
 }
 
 void DisplayConfigurationObserver::OnDisplaysInitialized() {
   // Update the display pref with the initial power state.
-  if (ash::Shell::GetInstance()->delegate()->IsFirstRunAfterBoot())
+  if (ash::WmShell::Get()->delegate()->IsFirstRunAfterBoot())
     StoreDisplayPrefs();
 }
 
 void DisplayConfigurationObserver::OnDisplayConfigurationChanged() {
   StoreDisplayPrefs();
 }
 
 }  // namespace chromeos