Moves Shell::maximize_mode_controller() to WmShell

chrome/browser/ui/webui/chromeos/touch_view_controller_delegate.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/ui/webui/chromeos/touch_view_controller_delegate.h"
 
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
-#include "ash/shell.h"
 
 namespace chromeos {
 
 TouchViewControllerDelegate::TouchViewControllerDelegate() {
   ash::WmShell::Get()->AddShellObserver(this);
 }
 
 TouchViewControllerDelegate::~TouchViewControllerDelegate() {
   ash::WmShell::Get()->RemoveShellObserver(this);
 }
 
 void TouchViewControllerDelegate::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void TouchViewControllerDelegate::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 bool TouchViewControllerDelegate::IsMaximizeModeEnabled() const {
-  return ash::Shell::GetInstance()->maximize_mode_controller()->
-      IsMaximizeModeWindowManagerEnabled();
+  return ash::WmShell::Get()
+      ->maximize_mode_controller()
+      ->IsMaximizeModeWindowManagerEnabled();
 }
 
 void TouchViewControllerDelegate::OnMaximizeModeStarted() {
   FOR_EACH_OBSERVER(Observer, observers_, OnMaximizeModeStarted());
 }
 
 void TouchViewControllerDelegate::OnMaximizeModeEnded() {
   FOR_EACH_OBSERVER(Observer, observers_, OnMaximizeModeEnded());
 }
 
 }  // namespace chromeos