Start removing deprecated Options UI code

chrome/browser/about_flags.cc

 // 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2224 matching lines @@
      flag_descriptions::kEnableMaterialDesignBookmarksName,
      flag_descriptions::kEnableMaterialDesignBookmarksDescription, kOsDesktop,
      FEATURE_VALUE_TYPE(features::kMaterialDesignBookmarks)},
     {"enable-md-feedback", flag_descriptions::kEnableMaterialDesignFeedbackName,
      flag_descriptions::kEnableMaterialDesignFeedbackDescription, kOsDesktop,
      SINGLE_VALUE_TYPE(switches::kEnableMaterialDesignFeedback)},
     {"enable-md-incognito-ntp",
      flag_descriptions::kMaterialDesignIncognitoNTPName,
      flag_descriptions::kMaterialDesignIncognitoNTPDescription, kOsAll,
      FEATURE_VALUE_TYPE(features::kMaterialDesignIncognitoNTP)},
-    {"enable-md-settings", flag_descriptions::kEnableMaterialDesignSettingsName,
-     flag_descriptions::kEnableMaterialDesignSettingsDescription, kOsDesktop,
-     FEATURE_VALUE_TYPE(features::kMaterialDesignSettings)},
     {"safe-search-url-reporting",
      flag_descriptions::kSafeSearchUrlReportingName,
      flag_descriptions::kSafeSearchUrlReportingDescription, kOsAll,
      FEATURE_VALUE_TYPE(features::kSafeSearchUrlReporting)},
     {"force-ui-direction", flag_descriptions::kForceUiDirectionName,
      flag_descriptions::kForceUiDirectionDescription, kOsAll,
      MULTI_VALUE_TYPE(kForceUIDirectionChoices)},
     {"force-text-direction", flag_descriptions::kForceTextDirectionName,
      flag_descriptions::kForceTextDirectionDescription, kOsAll,
      MULTI_VALUE_TYPE(kForceTextDirectionChoices)},
@@ skipping 1017 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags