ActiveJob::Base no longer dependents on Serializers

activejob/lib/active_job/base.rb

@@ -60,7 +60,6 @@ module ActiveJob #:nodoc:
   # * SerializationError - Error class for serialization errors.
   class Base
     include Core
-    include Serializers
     include QueueAdapter
     include QueueName
     include QueuePriority

activejob/lib/active_job/serializers.rb

@@ -7,7 +7,6 @@ module ActiveJob
   # and to add new ones. It also has helpers to serialize/deserialize objects.
   module Serializers # :nodoc:
     extend ActiveSupport::Autoload
-    extend ActiveSupport::Concern
 
     autoload :ObjectSerializer
     autoload :SymbolSerializer