rails/rails — pull request #15356 by deeeki (2014-05-27 04:02:04+00:00)
Title: Remove `require 'active_support'` from individual modules

Let users require `active_support` before loading any ActiveSupport modules.
http://guides.rubyonrails.org/active_support_core_extensions.html

refs #15167

FYI, the remains

```
$ git grep "require ['|\"]active_support['|\"]" activesupport/
activesupport/bin/generate_tables: require 'active_support'
activesupport/lib/active_support/all.rb:require 'active_support'
activesupport/test/abstract_unit.rb:require 'active_support'
```