Revert "clean up lazy loading of serialization support for

ActiveRecord::Base and ActionController::Base"

The whole idea of having a lazy hook is that it can be executed
in the context of different targets. The moment you hardcode the class,
the hooks can no longer run in the proper context.

This reverts commit 506e2ac9ad.

lib/active_model_serializers.rb

@@ -57,7 +57,7 @@ module ActiveModel::SerializerSupport
 end
 
 ActiveSupport.on_load(:active_record) do
-  ActiveRecord::Base.send(:include, ActiveModel::SerializerSupport)
+  include ActiveModel::SerializerSupport
 end
 
 module ActiveModel::ArraySerializerSupport
@@ -78,7 +78,7 @@ begin
   require 'action_controller/serialization'
 
   ActiveSupport.on_load(:action_controller) do
-    ActionController::Base.send(:include, ActionController::Serialization)
+    include ::ActionController::Serialization
   end
 rescue LoadError => ex
   # rails on installed, continuing

test/serializer_support_test.rb

@@ -9,8 +9,6 @@ class RandomModelCollection
 end
 
 module ActiveRecord
-  class Base
-  end
   class Relation
   end
 end
@@ -28,15 +26,5 @@ class SerializerSupportTest < ActiveModel::TestCase
     ActiveSupport.run_load_hooks(:active_record)
     assert_equal ActiveModel::ArraySerializer, ActiveRecord::Relation.new.active_model_serializer
   end
-
-  test "it automatically includes serializer support in active_record/base" do
-    ActiveSupport.run_load_hooks(:active_record)
-    assert ActiveRecord::Base.new.respond_to?(:active_model_serializer)
-  end
-
-  test "it automatically includes serializer support in action_controller/base" do
-    ActiveSupport.run_load_hooks(:action_controller)
-    assert ActionController::Base.new.respond_to?(:serialization_scope)
-  end
 end