Remove MaterialDesignController::IsModeMaterial

ui/native_theme/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("native_theme") {
   sources = [
     "common_theme.cc",
@@ skipping 42 matching lines @@
     ]
   }
 }
 
 if (is_win) {
   component("native_theme_browser") {
     defines = [ "NATIVE_THEME_IMPLEMENTATION" ]
 
     # These files cannot work in the renderer on Windows.
     sources = [
-      "native_theme_dark_win.cc",
-      "native_theme_dark_win.h",
       "native_theme_win.cc",
       "native_theme_win.h",
     ]
 
     deps = [
       ":native_theme",
       "//base",
       "//ui/base",
       "//ui/display",
       "//ui/gfx",
@@ skipping 18 matching lines @@
   deps = [
     ":native_theme",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//skia:skia",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx/geometry:geometry",
   ]
 }