Ozone: Remove the caca platform from the tree

ui/ozone/platform/caca/caca_window_manager.h

-// Copyright 2014 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_OZONE_PLATFORM_CACA_CACA_WINDOW_MANAGER_H_
-#define UI_OZONE_PLATFORM_CACA_CACA_WINDOW_MANAGER_H_
-
-#include <stdint.h>
-
-#include <memory>
-
-#include "base/id_map.h"
-#include "base/macros.h"
-#include "base/threading/thread_checker.h"
-#include "ui/ozone/public/surface_factory_ozone.h"
-
-namespace gfx {
-class Rect;
-}
-
-namespace ui {
-
-class CacaWindow;
-
-class CacaWindowManager : public SurfaceFactoryOzone {
- public:
-  CacaWindowManager();
-  ~CacaWindowManager() override;
-
-  // Register a new libcaca window/instance. Returns the window id.
-  int32_t AddWindow(CacaWindow* window);
-
-  // Remove a libcaca window/instance.
-  void RemoveWindow(int32_t window_id, CacaWindow* window);
-
-  // ui::SurfaceFactoryOzone overrides:
-  std::unique_ptr<SurfaceOzoneCanvas> CreateCanvasForWidget(
-      gfx::AcceleratedWidget widget) override;
-
- private:
-  IDMap<CacaWindow> windows_;
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(CacaWindowManager);
-};
-
-}  // namespace ui
-
-#endif  // UI_OZONE_PLATFORM_CACA_CACA_WINDOW_MANAGER_H_