Rename StackingClient -> WindowTreeClient

ui/aura/client/stacking_client.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 "ui/aura/client/stacking_client.h"
-
-#include "ui/aura/env.h"
-#include "ui/aura/root_window.h"
-#include "ui/aura/window_property.h"
-
-DECLARE_WINDOW_PROPERTY_TYPE(aura::client::StackingClient*)
-
-namespace aura {
-namespace client {
-
-DEFINE_WINDOW_PROPERTY_KEY(
-    StackingClient*, kRootWindowStackingClientKey, NULL);
-
-void SetStackingClient(Window* window, StackingClient* stacking_client) {
-  DCHECK(window);
-
-  RootWindow* root_window = window->GetRootWindow();
-  DCHECK(root_window);
-  root_window->SetProperty(kRootWindowStackingClientKey, stacking_client);
-}
-
-StackingClient* GetStackingClient(Window* window) {
-  DCHECK(window);
-  RootWindow* root_window = window->GetRootWindow();
-  DCHECK(root_window);
-  StackingClient* root_window_stacking_client =
-      root_window->GetProperty(kRootWindowStackingClientKey);
-  DCHECK(root_window_stacking_client);
-  return root_window_stacking_client;
-}
-
-}  // namespace client
-}  // namespace aura