How can I apply pull request that was made for a parent repository of my fork into codebar of my fork. Not sure anyone can understand this question :), I'll try to explain with an an example.

There is a repo https://github.com/balupton/history.js, there are some pull request for this repo that has not been merged into the codebase, for example this one https://github.com/balupton/history.js/pull/251/commits. For some reason original developer do not accept it. Now, I have forked this repo https://github.com/prudnikov/history.js and want to merge this particular pull request into mu repository. How can I do this?