mash: Migrate shelf app list button to wm common types

chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.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/ash/multi_user/user_switch_animator_chromeos.h"
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_positioner.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 95 matching lines @@
 UserSwitchAnimatorChromeOS::UserSwitchAnimatorChromeOS(
     MultiUserWindowManagerChromeOS* owner,
     const AccountId& new_account_id,
     int animation_speed_ms)
     : owner_(owner),
       new_account_id_(new_account_id),
       animation_speed_ms_(animation_speed_ms),
       animation_step_(ANIMATION_STEP_HIDE_OLD_USER),
       screen_cover_(GetScreenCover(NULL)),
       windows_by_account_id_() {
-  ash::Shell::GetInstance()->DismissAppList();
+  ash::WmShell::Get()->DismissAppList();
   BuildUserToWindowsListMap();
   AdvanceUserTransitionAnimation();
 
   if (!animation_speed_ms_) {
     FinalizeAnimation();
   } else {
     user_changed_animation_timer_.reset(new base::Timer(
         FROM_HERE,
         base::TimeDelta::FromMilliseconds(animation_speed_ms_),
         base::Bind(
@@ skipping 306 matching lines @@
         if (itr != window_to_entry_map.end()) {
           windows_by_account_id_[itr->second->show_for_user()].push_back(
               child_window);
         }
       }
     }
   }
 }
 
 }  // namespace chrome