Fix plugin new --mountable: ActionController instead of ActiveController

railties/lib/rails/generators/rails/plugin_new/templates/app/controllers/%name%/application_controller.rb.tt

 module <%= camelized %>
-  class ApplicationController < ActiveController::Base
+  class ApplicationController < ActionController::Base
   end
 end

railties/test/generators/plugin_new_generator_test.rb

@@ -135,7 +135,7 @@ def test_create_mountable_application_with_mountable_option
     assert_file "config/routes.rb", /Bukkits::Engine.routes.draw do/
     assert_file "lib/bukkits/engine.rb", /isolate_namespace Bukkits/
     assert_file "test/dummy/config/routes.rb", /mount Bukkits::Engine => "\/bukkits"/
-    assert_file "app/controllers/bukkits/application_controller.rb", /module Bukkits\n  class ApplicationController < ActiveController::Base/
+    assert_file "app/controllers/bukkits/application_controller.rb", /module Bukkits\n  class ApplicationController < ActionController::Base/
     assert_file "app/helpers/bukkits/application_helper.rb", /module Bukkits\n  module ApplicationHelper/
   end