Revert "Merge pull request rails#11053 from yangchenyun/mine"

Those two files are required by active_support/rails.rb
loaded in active_model.rb

It is common to require common dependencies on the root
files to avoid boilerplate in each file.

This reverts commit 763635e, reversing
changes made to 4f46ef3.

activemodel/lib/active_model/naming.rb

@@ -1,7 +1,5 @@
 require 'active_support/core_ext/hash/except'
 require 'active_support/core_ext/module/introspection'
-require 'active_support/core_ext/module/delegation'
-require 'active_support/core_ext/object/blank'
 
 module ActiveModel
   class Name