Simplifies page_caching.rb

There is an explicit require for

    action_controller/caching/pages.rb

so there is no need for ActiveSupport::Autoload idioms here.

Author: fxn

lib/action_controller/page_caching.rb

@@ -2,12 +2,8 @@
 
 module ActionController
   module Caching
-    eager_autoload do
-      autoload :Pages
-    end
-
     include Pages
   end
 end
 
-ActionController::Base.send(:include, ActionController::Caching::Pages)
+ActionController::Base.include(ActionController::Caching::Pages)