Include GonHelper separately and remove created_at in factory

app/controllers/application_controller.rb

@@ -3,6 +3,7 @@ require 'fogbugz'
 
 class ApplicationController < ActionController::Base
   include Gitlab::CurrentSettings
+  include Gitlab::GonHelper
   include GitlabRoutingHelper
   include PageLayoutHelper
 

app/controllers/oauth/applications_controller.rb

 class Oauth::ApplicationsController < Doorkeeper::ApplicationsController
   include Gitlab::CurrentSettings
+  include Gitlab::GonHelper
   include PageLayoutHelper
 
   before_action :verify_user_oauth_applications_enabled

lib/gitlab/current_settings.rb

 module Gitlab
   module CurrentSettings
-    include ::Gitlab::GonHelper
-
     def current_application_settings
       key = :current_application_settings
 

spec/factories/oauth_access_tokens.rb

@@ -18,6 +18,5 @@ FactoryGirl.define do
     resource_owner
     application
     token '123456'
-    created_at :datetime
   end
 end