Renames aura::client::WindowTreeClient to WindowParentingClient

ui/aura/test/test_window_tree_client.h

-// 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.
-
-#ifndef UI_AURA_TEST_TEST_WINDOW_TREE_CLIENT_H_
-#define UI_AURA_TEST_TEST_WINDOW_TREE_CLIENT_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "ui/aura/aura_export.h"
-#include "ui/aura/client/window_tree_client.h"
-
-namespace aura {
-namespace test {
-
-class TestWindowTreeClient : public client::WindowTreeClient {
- public:
-  explicit TestWindowTreeClient(Window* root_window);
-  ~TestWindowTreeClient() override;
-
-  // Overridden from client::WindowTreeClient:
-  Window* GetDefaultParent(Window* context,
-                           Window* window,
-                           const gfx::Rect& bounds) override;
-
- private:
-  Window* root_window_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestWindowTreeClient);
-};
-
-}  // namespace test
-}  // namespace aura
-
-#endif  // UI_AURA_TEST_TEST_WINDOW_TREE_CLIENT_H_