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

chrome/browser/chromeos/extensions/first_run_private_api.cc

Index: chrome/browser/chromeos/extensions/first_run_private_api.cc
diff --git a/chrome/browser/chromeos/extensions/first_run_private_api.cc b/chrome/browser/chromeos/extensions/first_run_private_api.cc
index 665c51db716569dba334807c8ee5b7883a124492..effbec0c363bad4c637a8585179f369a827af910 100644
--- a/chrome/browser/chromeos/extensions/first_run_private_api.cc
+++ b/chrome/browser/chromeos/extensions/first_run_private_api.cc
@@ -45,7 +45,7 @@ bool FirstRunPrivateGetLocalizedStringsFunction::RunSync() {
   localized_strings->SetString(
       "closeButton",
       l10n_util::GetStringUTF16(IDS_CLOSE));
-  webui::SetFontAndTextDirection(localized_strings);
+  webui::SetTextDirection(localized_strings);
   SetResult(localized_strings);
   return true;
 }