Googlebot seems to parse Javascript and inserts our browser update message

into their search results. If our client is googlebot, don't tell them to
update their browser.

vendor/assets/javascripts/browser-update.js.erb

@@ -22,6 +22,11 @@ var $buo = function() {
       return;
   }
 
+  // we don't ask Googlebot to update their browser
+  if (ua.indexOf('Googlebot') >= 0) {
+      return;
+  }
+
   // retrieve localized browser upgrade text
   var t = <%= "'" + I18n.t('js.browser_update') + "'" %>;