Revert "Leave all our tests as order_dependent! for now"

This reverts commit 2f52f96988.

Conflicts:
	actionmailer/test/abstract_unit.rb
	actionview/test/abstract_unit.rb
	activemodel/test/cases/helper.rb
	activerecord/test/cases/helper.rb
	activesupport/test/abstract_unit.rb
	railties/test/abstract_unit.rb

actionmailer/test/abstract_unit.rb

@@ -42,8 +42,3 @@ def jruby_skip(message = '')
 end
 
 require 'mocha/setup' # FIXME: stop using mocha
-
-# FIXME: we have tests that depend on run order, we should fix that and
-# remove this method call.
-require 'active_support/test_case'
-ActiveSupport::TestCase.test_order = :sorted

actionview/test/abstract_unit.rb

@@ -338,8 +338,3 @@ def jruby_skip(message = '')
 end
 
 require 'mocha/setup' # FIXME: stop using mocha
-
-# FIXME: we have tests that depend on run order, we should fix that and
-# remove this method call.
-require 'active_support/test_case'
-ActiveSupport::TestCase.test_order = :sorted

activemodel/test/cases/helper.rb

@@ -22,8 +22,3 @@ end
 def jruby_skip(message = '')
   skip message if defined?(JRUBY_VERSION)
 end
-
-# FIXME: we have tests that depend on run order, we should fix that and
-# remove this method call.
-require 'active_support/test_case'
-ActiveSupport::TestCase.test_order = :sorted

activerecord/test/cases/helper.rb

@@ -203,8 +203,3 @@ module InTimeZone
 end
 
 require 'mocha/setup' # FIXME: stop using mocha
-
-# FIXME: we have tests that depend on run order, we should fix that and
-# remove this method call.
-require 'active_support/test_case'
-ActiveSupport::TestCase.test_order = :sorted

activesupport/test/abstract_unit.rb

@@ -38,8 +38,3 @@ def jruby_skip(message = '')
 end
 
 require 'mocha/setup' # FIXME: stop using mocha
-
-# FIXME: we have tests that depend on run order, we should fix that and
-# remove this method call.
-require 'active_support/test_case'
-ActiveSupport::TestCase.test_order = :sorted

railties/test/abstract_unit.rb

@@ -30,9 +30,4 @@ end
 
 class ActiveSupport::TestCase
   include ActiveSupport::Testing::Stream
-
-  # FIXME: we have tests that depend on run order, we should fix that and
-  # remove this method call.
-  self.test_order = :sorted
-
 end