learn to clean up after myself

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5266 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -111,10 +111,6 @@ def table_alias_length
         63
       end
 
-      def requires_order_columns_in_distinct_clause? # :nodoc:
-        true
-      end
-
       # QUOTING ==================================================
 
       def quote(value, column = nil)