These are already required through AS/rails

* core_ext/object/blank
* concern
* core_ext/class/attribute
* deprecation

actionpack/lib/action_controller/metal/conditional_get.rb

@@ -1,5 +1,3 @@
-require 'active_support/core_ext/class/attribute'
-
 module ActionController
   module ConditionalGet
     extend ActiveSupport::Concern

actionpack/lib/action_controller/metal/strong_parameters.rb

@@ -1,4 +1,3 @@
-require 'active_support/concern'
 require 'active_support/core_ext/hash/indifferent_access'
 require 'active_support/core_ext/array/wrap'
 require 'active_support/rescuable'

actionpack/lib/action_controller/record_identifier.rb

@@ -1,4 +1,3 @@
-require 'active_support/deprecation'
 require 'action_view/record_identifier'
 
 module ActionController

actionpack/lib/action_view/template.rb

@@ -1,6 +1,5 @@
 require 'active_support/core_ext/object/try'
 require 'active_support/core_ext/kernel/singleton_class'
-require 'active_support/deprecation'
 require 'thread'
 
 module ActionView

actionpack/lib/action_view/template/types.rb

@@ -1,6 +1,5 @@
 require 'set'
 require 'active_support/core_ext/class/attribute_accessors'
-require 'active_support/core_ext/object/blank'
 
 module ActionView
   class Template