MD Settings: About page, show error messages with <br> and <pre> tags.

chrome/browser/resources/settings/about_page/about_page.js

Index: chrome/browser/resources/settings/about_page/about_page.js
diff --git a/chrome/browser/resources/settings/about_page/about_page.js b/chrome/browser/resources/settings/about_page/about_page.js
index 0f54c43211a4c32606b6b477b0625e911cecbd35..cb26f366b61db5654928c88eb6155d1350aa9c96 100644
--- a/chrome/browser/resources/settings/about_page/about_page.js
+++ b/chrome/browser/resources/settings/about_page/about_page.js
@@ -277,17 +277,16 @@ Polymer({
         return this.i18n('aboutUpgradeUpdating');
       default:
         function formatMessage(msg) {
-          return '<div>' +
-              parseHtmlSubset('<b>' + msg + '</b>').firstChild.innerHTML +
-              '</div>';
+          return parseHtmlSubset(
+              '<b>' + msg + '</b>', ['br', 'pre']).firstChild.innerHTML;
         }
         var result = '';
         var message = this.currentUpdateStatusEvent_.message;
-        if (!!message)
+        if (message)
           result += formatMessage(message);
         var connectMessage = this.currentUpdateStatusEvent_.connectionTypes;
-        if (!!connectMessage)
-          result += formatMessage(connectMessage);
+        if (connectMessage)
+          result += '<div>' + formatMessage(connectMessage) + '</div>';
         return result;
     }
   },