Merge pull request #38922 from kirs/remove-dead-code-pooled_connections_test

Remove dead code in tests

activerecord/test/cases/pooled_connections_test.rb

@@ -70,9 +70,4 @@ def test_pooled_connection_remove
     ActiveRecord::Base.connection_pool.remove(extra_connection)
     assert_equal ActiveRecord::Base.connection, old_connection
   end
-
-  private
-    def add_record(name)
-      ActiveRecord::Base.connection_pool.with_connection { Project.create! name: name }
-    end
 end unless in_memory_db?