[MD Settings] Add feature to enable md-settings by default.

chrome/browser/ui/webui/uber/uber_ui.cc

Index: chrome/browser/ui/webui/uber/uber_ui.cc
diff --git a/chrome/browser/ui/webui/uber/uber_ui.cc b/chrome/browser/ui/webui/uber/uber_ui.cc
index ea1a5bfe9a9edeab99e41183be86b65702f4dc80..26d1b178f3464553b064a455c09d72936af30c5f 100644
--- a/chrome/browser/ui/webui/uber/uber_ui.cc
+++ b/chrome/browser/ui/webui/uber/uber_ui.cc
@@ -96,7 +96,9 @@ content::WebUIDataSource* CreateUberFrameHTMLSource(
 
   source->AddBoolean("hideExtensions", ::switches::MdExtensionsEnabled());
   source->AddBoolean("hideSettingsAndHelp",
-                     ::switches::SettingsWindowEnabled());
+                     ::switches::SettingsWindowEnabled() ||
+                         base::FeatureList::IsEnabled(
+                             features::kMaterialDesignSettingsFeature));
   source->AddString("extensionsHost", chrome::kChromeUIExtensionsHost);
   source->AddLocalizedString("extensionsDisplayName",
                              IDS_MANAGE_EXTENSIONS_SETTING_WINDOWS_TITLE);