mash: Migrate shelf app list button to wm common types

ash/accelerators/accelerator_controller.cc

 // Copyright (c) 2012 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 "ash/accelerators/accelerator_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include <utility>
@@ skipping 475 matching lines @@
     // feature uses. crbug.com/132296
     if (WmShell::Get()->accessibility_delegate()->IsSpokenFeedbackEnabled())
       return false;
   }
   return true;
 }
 
 void HandleToggleAppList(const ui::Accelerator& accelerator) {
   if (accelerator.key_code() == ui::VKEY_LWIN)
     base::RecordAction(base::UserMetricsAction("Accel_Search_LWin"));
-  Shell::GetInstance()->ToggleAppList(NULL);
+  WmShell::Get()->ToggleAppList();
 }
 
 void HandleToggleFullscreen(const ui::Accelerator& accelerator) {
   if (accelerator.key_code() == ui::VKEY_MEDIA_LAUNCH_APP2)
     base::RecordAction(UserMetricsAction("Accel_Fullscreen_F4"));
   accelerators::ToggleFullscreen();
 }
 
 void HandleToggleOverview() {
   base::RecordAction(base::UserMetricsAction("Accel_Overview_F5"));
@@ skipping 901 matching lines @@
   if (wm_shell->mru_window_tracker()->BuildMruWindowList().empty() &&
       actions_needing_window_.find(action) != actions_needing_window_.end()) {
     wm_shell->accessibility_delegate()->TriggerAccessibilityAlert(
         A11Y_ALERT_WINDOW_NEEDED);
     return RESTRICTION_PREVENT_PROCESSING_AND_PROPAGATION;
   }
   return RESTRICTION_NONE;
 }
 
 }  // namespace ash