Start removing deprecated Options UI code

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
 const char kEnableMaterialDesignBookmarksName[] =
     "Enable Material Design bookmarks";
 
 const char kEnableMaterialDesignBookmarksDescription[] =
     "If enabled, the chrome://bookmarks/ URL loads the Material Design "
     "bookmarks page.";
 
 //  Material Design version of chrome://policy
 
 const char kEnableMaterialDesignPolicyPageName[] =
     "Enable Material Design policy page";
 
 const char kEnableMaterialDesignPolicyPageDescription[] =
     "If enabled, the chrome://md-policy URL loads the Material Design "
     "policy page.";
 
-//  Material Design version of chrome://settings
-
-const char kEnableMaterialDesignSettingsName[] =
-    "Enable Material Design settings";
-
-const char kEnableMaterialDesignSettingsDescription[] =
-    "If enabled, the chrome://settings/ URL loads the Material Design "
-    "settings page.";
-
 //  Material Design version of chrome://extensions
 
 const char kEnableMaterialDesignExtensionsName[] =
     "Enable Material Design extensions";
 
 const char kEnableMaterialDesignExtensionsDescription[] =
     "If enabled, the chrome://extensions/ URL loads the Material Design "
     "extensions page.";
 
 //  Material Design version of feedback form
@@ skipping 3161 matching lines @@
 
 const char kDisableNewVirtualKeyboardBehaviorName[] =
     "New window behavior for the accessibility keyboard";
 const char kDisableNewVirtualKeyboardBehaviorDescription[] =
     "Disable new window behavior for the accessibility keyboard "
     "in non-sticky mode (do not change work area in non-sticky mode).";
 
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace flag_descriptions