Directly inline shared WebUI CSS declarations into the security and supervised user interstitials.

content/browser/webui/web_ui_data_source_impl.cc

Index: content/browser/webui/web_ui_data_source_impl.cc
diff --git a/content/browser/webui/web_ui_data_source_impl.cc b/content/browser/webui/web_ui_data_source_impl.cc
index bbe54f624e14bad899aecc56448faf60e35b764a..f381853c01a3078ecc6251ce7a6aaf5e16676107 100644
--- a/content/browser/webui/web_ui_data_source_impl.cc
+++ b/content/browser/webui/web_ui_data_source_impl.cc
@@ -232,7 +232,7 @@ void WebUIDataSourceImpl::SendLocalizedStringsAsJSON(
     const URLDataSource::GotDataCallback& callback) {
   std::string template_data;
   if (!disable_set_font_strings_)
-    webui::SetFontAndTextDirection(&localized_strings_);
+    webui::SetTextDirection(&localized_strings_);
 
   webui::AppendJsonJS(&localized_strings_, &template_data);
   callback.Run(base::RefCountedString::TakeString(&template_data));