Move controller configs to sprockets own railtie.

actionpack/lib/action_controller/railtie.rb

@@ -4,6 +4,7 @@
 require "action_view/railtie"
 require "abstract_controller/railties/routes_helpers"
 require "action_controller/railties/paths"
+require "sprockets/railtie"
 
 module ActionController
   class Railtie < Rails::Railtie
@@ -21,7 +22,6 @@ class Railtie < Rails::Railtie
       paths   = app.config.paths
       options = app.config.action_controller
 
-      options.use_sprockets        ||= app.config.assets.enabled
       options.assets_dir           ||= paths["public"].first
       options.javascripts_dir      ||= paths["public/javascripts"].first
       options.stylesheets_dir      ||= paths["public/stylesheets"].first

actionpack/lib/sprockets/railtie.rb

+require "sprockets"
+
+class Sprockets::Railtie < Rails::Railtie
+  initializer "sprockets.set_configs", :after => "action_controller.set_configs" do |app|
+    ActiveSupport.on_load(:action_controller) do
+      self.use_sprockets = app.config.assets.enabled
+    end
+  end
+end
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