Obsolete the ozone code path in ui/views/

ui/views/widget/desktop_aura/desktop_factory_ozone.h

-// Copyright 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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_FACTORY_OZONE_H_
-#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_FACTORY_OZONE_H_
-
-#include "ui/views/views_export.h"
-
-namespace display {
-class Screen;
-}
-
-namespace views {
-class DesktopNativeWidgetAura;
-class DesktopWindowTreeHost;
-
-namespace internal {
-class NativeWidgetDelegate;
-}
-
-class VIEWS_EXPORT DesktopFactoryOzone {
- public:
-  DesktopFactoryOzone();
-  virtual ~DesktopFactoryOzone();
-
-  // Returns the instance.
-  static DesktopFactoryOzone* GetInstance();
-
-  // Sets the implementation delegate. Ownership is retained by the caller.
-  static void SetInstance(DesktopFactoryOzone* impl);
-
-  // Delegates implementation of DesktopWindowTreeHost::Create externally to
-  // Ozone implementation.
-  virtual DesktopWindowTreeHost* CreateWindowTreeHost(
-      internal::NativeWidgetDelegate* native_widget_delegate,
-      DesktopNativeWidgetAura* desktop_native_widget_aura) = 0;
-
-  // Delegates implementation of DesktopScreen externally to
-  // Ozone implementation.
-  virtual display::Screen* CreateDesktopScreen() = 0;
-
- private:
-  static DesktopFactoryOzone* impl_; // not owned
-};
-
-}  // namespace views
-
-#endif // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_FACTORY_OZONE_H_