It is time.

ui/native_theme/fallback_theme.h

-// Copyright (c) 2012 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_NATIVE_THEME_FALLBACK_THEME_H_
-#define UI_NATIVE_THEME_FALLBACK_THEME_H_
-
-#include "ui/native_theme/native_theme_base.h"
-
-namespace ui {
-
-// This theme can draw UI controls on every platform. This is only used when
-// zooming a web page and the native theme doesn't support scaling.
-class NATIVE_THEME_EXPORT FallbackTheme : public NativeThemeBase {
- public:
-  FallbackTheme();
-  ~FallbackTheme() override;
-
- protected:
-  // Overridden from NativeThemeBase:
-  SkColor GetSystemColor(ColorId color_id) const override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(FallbackTheme);
-};
-
-}  // namespace ui
-
-#endif  // UI_NATIVE_THEME_FALLBACK_THEME_H_