Eliminate the duplicated `options_include_default?` method

Follow up 7ba2cd06.

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

@@ -14,8 +14,10 @@ def accept(o)
           send m, o
         end
 
-        delegate :quote_column_name, :quote_table_name, :quote_default_expression, :type_to_sql, to: :@conn
-        private :quote_column_name, :quote_table_name, :quote_default_expression, :type_to_sql
+        delegate :quote_column_name, :quote_table_name, :quote_default_expression, :type_to_sql,
+          :options_include_default?,  to: :@conn
+        private :quote_column_name, :quote_table_name, :quote_default_expression, :type_to_sql,
+          :options_include_default?
 
         private
 
@@ -89,10 +91,6 @@ def add_column_options!(sql, options)
             sql
           end
 
-          def options_include_default?(options)
-            options.include?(:default) && !(options[:null] == false && options[:default].nil?)
-          end
-
           def action_sql(action, dependency)
             case dependency
             when :nullify then "ON #{action} SET NULL"

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

@@ -986,6 +986,10 @@ def add_index_options(table_name, column_name, options = {}) #:nodoc:
         [index_name, index_type, index_columns, index_options, algorithm, using]
       end
 
+      def options_include_default?(options)
+        options.include?(:default) && !(options[:null] == false && options[:default].nil?)
+      end
+
       protected
         def add_index_sort_order(option_strings, column_names, options = {})
           if options.is_a?(Hash) && order = options[:order]
@@ -1012,10 +1016,6 @@ def quoted_columns_for_index(column_names, options = {})
           column_names.map {|name| quote_column_name(name) + option_strings[name]}
         end
 
-        def options_include_default?(options)
-          options.include?(:default) && !(options[:null] == false && options[:default].nil?)
-        end
-
         def index_name_for_remove(table_name, options = {})
           index_name = index_name(table_name, options)