mash: Migrate shelf app list button to wm common types

ash/accelerators/accelerator_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 "ash/accelerators/accelerator_delegate.h"
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/common/wm/window_state.h"
+#include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/wm/window_state_aura.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/events/event.h"
 #include "ui/wm/core/window_util.h"
 
 namespace ash {
 
 namespace {
 
@@ skipping 83 matching lines @@
     // send key events to a web content first, then will process keys
     // if the web content didn't consume them.
     return false;
   }
 
   // Handle preferred accelerators (such as ALT-TAB) before sending
   // to the target.
   if (shell->accelerator_controller()->IsPreferred(accelerator))
     return true;
 
-  return shell->GetAppListTargetVisibility();
+  return WmShell::Get()->GetAppListTargetVisibility();
 }
 
 }  // namespace ash