Convert --enable-md-history to a feature flag.

chrome/browser/ui/webui/chrome_web_ui_controller_factory.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/ui/webui/chrome_web_ui_controller_factory.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 35 matching lines @@
 #include "chrome/browser/ui/webui/profiler_ui.h"
 #include "chrome/browser/ui/webui/settings/md_settings_ui.h"
 #include "chrome/browser/ui/webui/signin/md_user_manager_ui.h"
 #include "chrome/browser/ui/webui/signin/profile_signin_confirmation_ui.h"
 #include "chrome/browser/ui/webui/signin_internals_ui.h"
 #include "chrome/browser/ui/webui/supervised_user_internals_ui.h"
 #include "chrome/browser/ui/webui/sync_internals_ui.h"
 #include "chrome/browser/ui/webui/translate_internals/translate_internals_ui.h"
 #include "chrome/browser/ui/webui/user_actions/user_actions_ui.h"
 #include "chrome/browser/ui/webui/version_ui.h"
+#include "chrome/common/chrome_features.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "components/dom_distiller/core/dom_distiller_constants.h"
 #include "components/dom_distiller/core/dom_distiller_features.h"
 #include "components/dom_distiller/core/dom_distiller_service.h"
 #include "components/dom_distiller/core/url_constants.h"
 #include "components/dom_distiller/webui/dom_distiller_ui.h"
 #include "components/favicon/core/favicon_service.h"
 #include "components/favicon_base/favicon_util.h"
@@ skipping 330 matching lines @@
     return &NewWebUI<NewTabUI>;
   if (url.host() == chrome::kChromeUIMdSettingsHost)
     return &NewWebUI<settings::MdSettingsUI>;
   // If the material design extensions page is enabled, it gets its own host.
   // Otherwise, it's handled by the uber settings page.
   if (url.host() == chrome::kChromeUIExtensionsHost &&
       ::switches::MdExtensionsEnabled()) {
     return &NewWebUI<extensions::ExtensionsUI>;
   }
   // Material Design history is on its own host, rather than on an Uber page.
-  if (::switches::MdHistoryEnabled() &&
+  if (base::FeatureList::IsEnabled(features::kMaterialDesignHistoryFeature) &&
       url.host() == chrome::kChromeUIHistoryHost) {
     return &NewWebUI<MdHistoryUI>;
   }
   if (url.host() == chrome::kChromeUIQuotaInternalsHost)
     return &NewWebUI<QuotaInternalsUI>;
   // Settings are implemented with native UI elements on Android.
   // Handle chrome://settings if settings in a window and about in settings
   // are enabled.
   if (url.host() == chrome::kChromeUISettingsFrameHost ||
       (url.host() == chrome::kChromeUISettingsHost &&
@@ skipping 359 matching lines @@
 #endif
 
   // Android doesn't use the plugins pages.
   if (page_url.host() == chrome::kChromeUIPluginsHost)
     return PluginsUI::GetFaviconResourceBytes(scale_factor);
 
 #endif
 
   return NULL;
 }