remove never called method `limited_update_conditions`

activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb

@@ -287,10 +287,6 @@ def empty_insert_statement_value
         "DEFAULT VALUES"
       end
 
-      def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
-        "WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{quoted_table_name} #{where_sql})"
-      end
-
       # Sanitizes the given LIMIT parameter in order to prevent SQL injection.
       #
       # The +limit+ may be anything that can evaluate to a string via #to_s. It

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -631,10 +631,6 @@ def case_insensitive_comparison(table, attribute, column, value)
         end
       end
 
-      def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
-        where_sql
-      end
-
       def strict_mode?
         self.class.type_cast_config_to_boolean(@config.fetch(:strict, true))
       end