Give MFA gates a more consistent UI

Summary: Depends on D20057. Currently, we show an "MFA" message on one of these and an "Error" message on the other, with different icons and colors. Use "MFA" for both, with the MFA icon / color.

Test Plan: Hit both varations, saw more consistency.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20059

src/aphront/handler/PhabricatorHighSecurityRequestExceptionHandler.php

@@ -78,15 +78,13 @@ final class PhabricatorHighSecurityRequestExceptionHandler
     $form_layout = $form->buildLayoutView();
 
     if ($is_upgrade) {
-      $messages = array(
-        pht(
+      $message = pht(
         'You are taking an action which requires you to enter '.
-          'high security.'),
-      );
+        'high security.');
 
       $info_view = id(new PHUIInfoView())
         ->setSeverity(PHUIInfoView::SEVERITY_MFA)
-        ->setErrors($messages);
+        ->setErrors(array($message));
 
       $dialog
         ->appendChild($info_view)
@@ -100,12 +98,18 @@ final class PhabricatorHighSecurityRequestExceptionHandler
             'period of time. When you are finished taking sensitive '.
             'actions, you should leave high security.'));
     } else {
+      $message = pht(
+        'You are taking an action which requires you to provide '.
+        'multi-factor credentials.');
+
+      $info_view = id(new PHUIInfoView())
+        ->setSeverity(PHUIInfoView::SEVERITY_MFA)
+        ->setErrors(array($message));
+
       $dialog
+        ->appendChild($info_view)
         ->setErrors(
           array(
-            pht(
-              'You are taking an action which requires you to provide '.
-              'multi-factor credentials.'),
           ))
         ->appendChild($form_layout);
     }