AM, AP, AV, and AMo tests are already order_independent!

actionmailer/test/abstract_unit.rb

@@ -51,8 +51,3 @@ 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.my_tests_are_order_dependent!

actionpack/test/abstract_unit.rb

@@ -497,8 +497,3 @@ def shutdown
   # Use N processes (N defaults to 4)
   Minitest.parallel_executor = ForkingExecutor.new(PROCESS_COUNT)
 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.my_tests_are_order_dependent!

actionview/test/abstract_unit.rb

@@ -340,8 +340,3 @@ 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.my_tests_are_order_dependent!

activemodel/test/cases/helper.rb

@@ -13,8 +13,3 @@
 require 'active_support/testing/autorun'
 
 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.my_tests_are_order_dependent!