Actually move ImplicitRender into it's own file

actionpack/lib/action_controller.rb

@@ -20,6 +20,7 @@ module ActionController
     autoload :Helpers
     autoload :HideActions
     autoload :HttpAuthentication
+    autoload :ImplicitRender
     autoload :Instrumentation
     autoload :MimeResponds
     autoload :RackDelegation

actionpack/lib/action_controller/base.rb

@@ -36,29 +36,6 @@ class Base < Metal
     # Add instrumentations hooks at the bottom, to ensure they instrument
     # all the methods properly.
     include ActionController::Instrumentation
-
-    # TODO: Extract into its own module
-    # This should be moved together with other normalizing behavior
-    module ImplicitRender
-      def send_action(*)
-        ret = super
-        default_render unless response_body
-        ret
-      end
-
-      def default_render
-        render
-      end
-
-      def method_for_action(action_name)
-        super || begin
-          if view_paths.exists?(action_name.to_s, details_for_render, controller_path)
-            "default_render"
-          end
-        end
-      end
-    end
-
     include ImplicitRender
 
     include ActionController::Rescue

actionpack/lib/action_controller/metal/implicit_render.rb

+module ActionController
+  module ImplicitRender
+    def send_action(*)
+      ret = super
+      default_render unless response_body
+      ret
+    end
+
+    def default_render
+      render
+    end
+
+    def method_for_action(action_name)
+      super || begin
+        if view_paths.exists?(action_name.to_s, details_for_render, controller_path)
+          "default_render"
+        end
+      end
+    end
+  end
+end
\ No newline at end of file