Renames aura::client::WindowTreeClient to WindowParentingClient

ui/aura/test/test_window_tree_client.cc

-// Copyright (c) 2013 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/test/test_window_tree_client.h"
-
-#include "ui/aura/window.h"
-
-namespace aura {
-namespace test {
-
-TestWindowTreeClient::TestWindowTreeClient(Window* root_window)
-    : root_window_(root_window) {
-  client::SetWindowTreeClient(root_window_, this);
-}
-
-TestWindowTreeClient::~TestWindowTreeClient() {
-  client::SetWindowTreeClient(root_window_, NULL);
-}
-
-Window* TestWindowTreeClient::GetDefaultParent(Window* context,
-                                               Window* window,
-                                               const gfx::Rect& bounds) {
-  return root_window_;
-}
-
-}  // namespace test
-}  // namespace aura