Revert "Merge pull request #27925 from robin850/hwia-removal"

Pointed out by @matthewd that the HWIA subclass changes the
AS scoped class and top-level HWIA hierarchies out from under
existing classes.

This reverts commit 71da39097b67114329be6d8db7fe6911124531af, reversing
changes made to 41c33bd4b2ec3f4a482e6030b6fda15091d81e4a.

1 files changed, 3 insertions, 3 deletions

diff --git a/activerecord/lib/active_record/attribute_methods/dirty.rb b/activerecord/lib/active_record/attribute_methods/dirty.rb
index 6aa414ba6b..31c1e687dc 100644
--- a/activerecord/lib/active_record/attribute_methods/dirty.rb
+++ b/activerecord/lib/active_record/attribute_methods/dirty.rb
@@ -50,7 +50,7 @@ module ActiveRecord
         super.tap do
           @previous_mutation_tracker = nil
           clear_mutation_trackers
-          @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new
+          @changed_attributes = HashWithIndifferentAccess.new
         end
       end
 
@@ -70,13 +70,13 @@ module ActiveRecord
 
       def changes_applied
         @previous_mutation_tracker = mutation_tracker
-        @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new
+        @changed_attributes = HashWithIndifferentAccess.new
         clear_mutation_trackers
       end
 
       def clear_changes_information
         @previous_mutation_tracker = nil
-        @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new
+        @changed_attributes = HashWithIndifferentAccess.new
         forget_attribute_assignments
         clear_mutation_trackers
       end