Remove Compatibility module since we don't remember why it was added 😄

actionpack/lib/action_controller.rb

@@ -16,7 +16,6 @@ module ActionController
   autoload :FormBuilder
 
   autoload_under "metal" do
-    autoload :Compatibility
     autoload :ConditionalGet
     autoload :Cookies
     autoload :DataStreaming

actionpack/lib/action_controller/api.rb

@@ -85,25 +85,6 @@ module ActionController
   class API < Metal
     abstract!
 
-    module Compatibility
-      def cache_store; end
-      def cache_store=(*); end
-      def assets_dir=(*); end
-      def javascripts_dir=(*); end
-      def stylesheets_dir=(*); end
-      def page_cache_directory=(*); end
-      def asset_path=(*); end
-      def asset_host=(*); end
-      def relative_url_root=(*); end
-      def perform_caching=(*); end
-      def helpers_path=(*); end
-      def allow_forgery_protection=(*); end
-      def helper_method(*); end
-      def helper(*); end
-    end
-
-    extend Compatibility
-
     # Shortcut helper that returns all the ActionController::API modules except the ones passed in the argument:
     #
     #   class MetalController