diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index 8f8def5922718f230bca6a8aac4c4dfc4d4ac33c..905dfb040b5d288d6d27dd50d42bbd6b3d1ba54e 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -1,6 +1,6 @@
 require 'active_support/descendants_tracker'
 require 'active_support/core_ext/array/wrap'
-require 'active_support/core_ext/class/inheritable_attributes'
+require 'active_support/core_ext/class/attribute'
 require 'active_support/core_ext/kernel/reporting'
 require 'active_support/core_ext/kernel/singleton_class'
 
@@ -437,7 +437,7 @@ def __update_callbacks(name, filters = [], block = nil) #:nodoc:
 
         ([self] + ActiveSupport::DescendantsTracker.descendants(self)).each do |target|
           chain = target.send("_#{name}_callbacks")
-          yield chain, type, filters, options
+          yield target, chain.dup, type, filters, options
           target.__define_runner(name)
         end
       end
@@ -473,7 +473,7 @@ def __update_callbacks(name, filters = [], block = nil) #:nodoc:
       def set_callback(name, *filter_list, &block)
         mapped = nil
 
-        __update_callbacks(name, filter_list, block) do |chain, type, filters, options|
+        __update_callbacks(name, filter_list, block) do |target, chain, type, filters, options|
           mapped ||= filters.map do |filter|
             Callback.new(chain, filter, type, options.dup, self)
           end
@@ -483,6 +483,8 @@ def set_callback(name, *filter_list, &block)
           end
 
           options[:prepend] ? chain.unshift(*(mapped.reverse)) : chain.push(*mapped)
+
+          target.send("_#{name}_callbacks=", chain)
         end
       end
 
@@ -493,7 +495,7 @@ def set_callback(name, *filter_list, &block)
       #   end
       #
       def skip_callback(name, *filter_list, &block)
-        __update_callbacks(name, filter_list, block) do |chain, type, filters, options|
+        __update_callbacks(name, filter_list, block) do |target, chain, type, filters, options|
           filters.each do |filter|
             filter = chain.find {|c| c.matches?(type, filter) }
 
@@ -505,6 +507,7 @@ def skip_callback(name, *filter_list, &block)
 
             chain.delete(filter)
           end
+          target.send("_#{name}_callbacks=", chain)
         end
       end
 
@@ -514,12 +517,14 @@ def reset_callbacks(symbol)
         callbacks = send("_#{symbol}_callbacks")
 
         ActiveSupport::DescendantsTracker.descendants(self).each do |target|
-          chain = target.send("_#{symbol}_callbacks")
+          chain = target.send("_#{symbol}_callbacks").dup
           callbacks.each { |c| chain.delete(c) }
+          target.send("_#{symbol}_callbacks=", chain)
           target.__define_runner(symbol)
         end
 
-        callbacks.clear
+        self.send("_#{symbol}_callbacks=", callbacks.dup.clear)
+
         __define_runner(symbol)
       end
 
@@ -589,9 +594,8 @@ def reset_callbacks(symbol)
       def define_callbacks(*callbacks)
         config = callbacks.last.is_a?(Hash) ? callbacks.pop : {}
         callbacks.each do |callback|
-          extlib_inheritable_reader("_#{callback}_callbacks") do
-            CallbackChain.new(callback, config)
-          end
+          class_attribute "_#{callback}_callbacks"
+          send("_#{callback}_callbacks=", CallbackChain.new(callback, config))
           __define_runner(callback)
         end
       end
diff --git a/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb b/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb
index af30bfc13a8409851e3117b5c176a690fdd149fb..043a650ea060551a6fe05da014e3dadf3c594c02 100644
--- a/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb
+++ b/activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb
@@ -169,86 +169,3 @@ def inherited_with_inheritable_attributes(child)
     alias inherited_without_inheritable_attributes inherited
     alias inherited inherited_with_inheritable_attributes
 end
-
-class Class
-  # Defines class-level inheritable attribute reader. Attributes are available to subclasses,
-  # each subclass has a copy of parent's attribute.
-  #
-  # @param *syms<Array[#to_s]> Array of attributes to define inheritable reader for.
-  # @return <Array[#to_s]> Array of attributes converted into inheritable_readers.
-  #
-  # @api public
-  #
-  # @todo Do we want to block instance_reader via :instance_reader => false
-  # @todo It would be preferable that we do something with a Hash passed in
-  #   (error out or do the same as other methods above) instead of silently
-  #   moving on). In particular, this makes the return value of this function
-  #   less useful.
-  def extlib_inheritable_reader(*ivars, &block)
-    options = ivars.extract_options!
-
-    ivars.each do |ivar|
-      self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
-        def self.#{ivar}
-          return @#{ivar} if self.object_id == #{self.object_id} || defined?(@#{ivar})
-          ivar = superclass.#{ivar}
-          return nil if ivar.nil? && !#{self}.instance_variable_defined?("@#{ivar}")
-          @#{ivar} = ivar.duplicable? ? ivar.dup : ivar
-        end
-      RUBY
-      unless options[:instance_reader] == false
-        self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
-          def #{ivar}
-            self.class.#{ivar}
-          end
-        RUBY
-      end
-      instance_variable_set(:"@#{ivar}", yield) if block_given?
-    end
-  end
-
-  # Defines class-level inheritable attribute writer. Attributes are available to subclasses,
-  # each subclass has a copy of parent's attribute.
-  #
-  # @param *syms<Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to
-  #   define inheritable writer for.
-  # @option syms :instance_writer<Boolean> if true, instance-level inheritable attribute writer is defined.
-  # @return <Array[#to_s]> An Array of the attributes that were made into inheritable writers.
-  #
-  # @api public
-  #
-  # @todo We need a style for class_eval <<-HEREDOC. I'd like to make it
-  #   class_eval(<<-RUBY, __FILE__, __LINE__), but we should codify it somewhere.
-  def extlib_inheritable_writer(*ivars)
-    options = ivars.extract_options!
-
-    ivars.each do |ivar|
-      self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
-        def self.#{ivar}=(obj)
-          @#{ivar} = obj
-        end
-      RUBY
-      unless options[:instance_writer] == false
-        self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
-          def #{ivar}=(obj) self.class.#{ivar} = obj end
-        RUBY
-      end
-
-      self.send("#{ivar}=", yield) if block_given?
-    end
-  end
-
-  # Defines class-level inheritable attribute accessor. Attributes are available to subclasses,
-  # each subclass has a copy of parent's attribute.
-  #
-  # @param *syms<Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to
-  #   define inheritable accessor for.
-  # @option syms :instance_writer<Boolean> if true, instance-level inheritable attribute writer is defined.
-  # @return <Array[#to_s]> An Array of attributes turned into inheritable accessors.
-  #
-  # @api public
-  def extlib_inheritable_accessor(*syms, &block)
-    extlib_inheritable_reader(*syms)
-    extlib_inheritable_writer(*syms, &block)
-  end
-end