mash: Migrate shelf app list button to wm common types

ash/shelf/shelf_widget.cc

 // Copyright 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/shelf/shelf_widget.h"
 
 #include "ash/aura/wm_shelf_aura.h"
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/ash_switches.h"
 #include "ash/common/focus_cycler.h"
@@ skipping 708 matching lines @@
   status_area_widget_->SchedulePaint();
 }
 
 bool ShelfWidget::GetDimsShelf() const {
   return delegate_view_->GetDimmed();
 }
 
 void ShelfWidget::CreateShelf(WmShelfAura* wm_shelf_aura) {
   DCHECK(!shelf_);
 
-  Shell* shell = Shell::GetInstance();
-  ShelfDelegate* delegate = shell->GetShelfDelegate();
-  shelf_.reset(new Shelf(shell->shelf_model(), delegate, wm_shelf_aura, this));
+  ShelfDelegate* delegate = Shell::GetInstance()->GetShelfDelegate();
+  shelf_.reset(
+      new Shelf(WmShell::Get()->shelf_model(), delegate, wm_shelf_aura, this));
   // Must be initialized before the delegate is notified because the delegate
   // may try to access the WmShelf.
   wm_shelf_aura->SetShelf(shelf_.get());
   delegate->OnShelfCreated(shelf_.get());
 
   SetFocusCycler(WmShell::Get()->focus_cycler());
 }
 
 void ShelfWidget::PostCreateShelf() {
   shelf_->SetVisible(
@@ skipping 78 matching lines @@
     shelf_layout_manager_->UpdateAutoHideForMouseEvent(event);
 }
 
 void ShelfWidget::OnGestureEvent(ui::GestureEvent* event) {
   Widget::OnGestureEvent(event);
   if (Shell::GetInstance()->in_mus() && shelf_layout_manager_)
     shelf_layout_manager_->UpdateAutoHideForGestureEvent(event);
 }
 
 }  // namespace ash