Remove MaterialDesignController::IsModeMaterial

ui/native_theme/native_theme_dark_win.cc

-// Copyright 2015 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.
-
-#include "ui/native_theme/native_theme_dark_win.h"
-
-#include "ui/base/material_design/material_design_controller.h"
-#include "ui/native_theme/native_theme_dark_aura.h"
-
-namespace ui {
-
-NativeThemeDarkWin* NativeThemeDarkWin::instance() {
-  CR_DEFINE_STATIC_LOCAL(NativeThemeDarkWin, s_native_theme, ());
-  return &s_native_theme;
-}
-
-NativeThemeDarkWin::NativeThemeDarkWin() {}
-
-NativeThemeDarkWin::~NativeThemeDarkWin() {}
-
-SkColor NativeThemeDarkWin::GetSystemColor(ColorId color_id) const {
-  if (!ui::MaterialDesignController::IsModeMaterial())
-    return NativeThemeWin::GetSystemColor(color_id);
-
-  return NativeThemeDarkAura::instance()->GetSystemColor(color_id);
-}
-
-}  // namespace ui