Fixed a bug in open_id_authentication, where relative_url_root is defined

on ActionController:AbstractRequest not Base

  #699

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2441 e93f8b46-1217-0410-a6f0-8f06a7374b81

vendor/plugins/open_id_authentication/lib/open_id_authentication.rb

@@ -222,7 +222,7 @@ module OpenIdAuthentication
       relative_url_root = self.class.respond_to?(:relative_url_root) ?
         self.class.relative_url_root.to_s :
         request.relative_url_root
-      "#{request.protocol}#{request.host_with_port}#{ActionController::Base.relative_url_root}#{request.path}"
+      "#{request.protocol}#{request.host_with_port}#{ActionController::AbstractRequest.relative_url_root}#{request.path}"
     end
 
     def timeout_protection_from_identity_server