Revert "chromeos: Move files in //ash/common to //ash, part 3"

ash/wm/stacking_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/wm/stacking_controller.h"
 
+#include "ash/common/wm_window.h"
 #include "ash/wm/container_finder.h"
-#include "ash/wm_window.h"
 
 namespace ash {
 
 ////////////////////////////////////////////////////////////////////////////////
 // StackingController, public:
 
 StackingController::StackingController() {}
 
 StackingController::~StackingController() {}
 
 ////////////////////////////////////////////////////////////////////////////////
 // StackingController, aura::client::WindowParentingClient implementation:
 
 aura::Window* StackingController::GetDefaultParent(aura::Window* context,
                                                    aura::Window* window,
                                                    const gfx::Rect& bounds) {
   return WmWindow::GetAuraWindow(wm::GetDefaultParent(
       WmWindow::Get(context), WmWindow::Get(window), bounds));
 }
 
 }  // namespace ash