Merge pull request #5631 from avakhov/ac-log-subsriber-small-refac

Make AC::LogSubscriber#send_file like #send_data

actionpack/lib/action_controller/log_subscriber.rb

@@ -33,9 +33,7 @@ module ActionController
     end
 
     def send_file(event)
-      message = "Sent file %s"
-      message << " (%.1fms)"
-      info(message % [event.payload[:path], event.duration])
+      info("Sent file %s (%.1fms)" % [event.payload[:path], event.duration])
     end
 
     def redirect_to(event)