[1/2][Ozone-Drm] Refactor GPU display management

ui/ozone/platform/drm/gpu/drm_display_mode.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_DRM_GPU_DRM_DISPLAY_MODE_H_
-#define UI_OZONE_PLATFORM_DRM_GPU_DRM_DISPLAY_MODE_H_
-
-#include <stdint.h>
-#include <stdlib.h>
-#include <xf86drmMode.h>
-
-#include "ui/display/types/display_mode.h"
-
-namespace ui {
-
-class DrmDisplayMode : public DisplayMode {
- public:
-  DrmDisplayMode(const drmModeModeInfo& mode);
-  ~DrmDisplayMode() override;
-
-  // Native details about this mode. Only used internally in the DRM
-  // implementation.
-  drmModeModeInfo mode_info() const { return mode_info_; }
-
- private:
-  drmModeModeInfo mode_info_;
-
-  DISALLOW_COPY_AND_ASSIGN(DrmDisplayMode);
-};
-
-}  // namespace ui
-
-#endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_DISPLAY_MODE_H_