Start removing deprecated Options UI code

chrome/common/chrome_features.cc

 // Copyright 2016 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 "chrome/common/chrome_features.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "extensions/features/features.h"
 #include "ppapi/features/features.h"
@@ skipping 183 matching lines @@
 // The material redesign of the Incognito NTP.
 const base::Feature kMaterialDesignIncognitoNTP{
   "MaterialDesignIncognitoNTP",
 #if defined(OS_ANDROID)
       base::FEATURE_DISABLED_BY_DEFAULT
 #else
       base::FEATURE_ENABLED_BY_DEFAULT
 #endif
 };
 
-// Enables or disables the Material Design version of chrome://settings.
-// Also affects chrome://help.
-const base::Feature kMaterialDesignSettings{"MaterialDesignSettings",
-                                            base::FEATURE_ENABLED_BY_DEFAULT};
-
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 // Enables media content bitstream remoting, an optimization that can activate
 // during Cast Tab Mirroring.
 const base::Feature kMediaRemoting{"MediaRemoting",
                                    base::FEATURE_DISABLED_BY_DEFAULT};
 
 // If enabled, replaces the <extensionview> controller in the route details view
 // of the Media Router dialog with the controller bundled with the WebUI
 // resources.
 const base::Feature kMediaRouterUIRouteController{
@@ skipping 159 matching lines @@
   return base::FeatureList::IsEnabled(features::kPrefService) ||
 #if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
          base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
              switches::kMusConfig) == switches::kMash;
 #else
          false;
 #endif
 }
 
 }  // namespace features