Shell related switches -> aura shell switches.

ui/aura/client/stacking_client.cc

 // Copyright (c) 2011 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 "ui/aura/client/stacking_client.h"
 
-#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 
 namespace aura {
 namespace client {
 
+const char kRootWindowStackingClient[] = "RootWindowStackingClient";
+
 void SetStackingClient(StackingClient* stacking_client) {
   RootWindow::GetInstance()->SetProperty(kRootWindowStackingClient,
                                          stacking_client);
 }
 
 // static
 StackingClient* GetStackingClient() {
   return reinterpret_cast<StackingClient*>(
       RootWindow::GetInstance()->GetProperty(kRootWindowStackingClient));
 }
 
 }  // namespace client
 }  // namespace aura