Revert of Mus Demo: Move definition of WindowTreeData into separate files.

services/ui/demo/window_tree_data.h

Index: services/ui/demo/window_tree_data.h
diff --git a/services/ui/demo/window_tree_data.h b/services/ui/demo/window_tree_data.h
deleted file mode 100644
index 6a8f4d87335425b4e7632295b5c582f5dc446bc3..0000000000000000000000000000000000000000
--- a/services/ui/demo/window_tree_data.h
+++ /dev/null
@@ -1,60 +0,0 @@
-// Copyright 2017 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 SERVICES_UI_DEMO_WINDOW_TREE_DATA_H_
-#define SERVICES_UI_DEMO_WINDOW_TREE_DATA_H_
-
-#include "base/memory/ptr_util.h"
-#include "base/timer/timer.h"
-
-namespace aura {
-class Window;
-class WindowTreeHostMus;
-}  // namespace aura
-
-namespace aura_extra {
-class ImageWindowDelegate;
-}  // namespace aura_extra
-
-namespace ui {
-namespace demo {
-
-class WindowTreeData {
- public:
-  explicit WindowTreeData(unsigned square_size);
-  ~WindowTreeData();
-
-  // Initializes the window tree host and start drawing frames.
-  void Init(std::unique_ptr<aura::WindowTreeHostMus> window_tree_host);
-  bool IsInitialized() const { return !!window_tree_host_; }
-
- private:
-  // Draws one frame, incrementing the rotation angle.
-  void DrawFrame();
-
-  // Helper function to retrieve the window to which we draw the bitmap.
-  aura::Window* bitmap_window();
-
-  // The Window tree host corresponding to this data.
-  std::unique_ptr<aura::WindowTreeHostMus> window_tree_host_;
-
-  // Destroys itself when the window gets destroyed.
-  aura_extra::ImageWindowDelegate* window_delegate_ = nullptr;
-
-  // Timer for calling DrawFrame().
-  base::RepeatingTimer timer_;
-
-  // Current rotation angle for drawing.
-  double angle_ = 0.0;
-
-  // Size in pixels of the square to draw.
-  const unsigned square_size_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowTreeData);
-};
-
-}  // namespace demo
-}  // namespace ui
-
-#endif  // SERVICES_UI_DEMO_WINDOW_TREE_DATA_H_