Remove a monkey-patch from a JavaScript method.

unpatch.js

// Unpatch.js
// Sam Greenhalgh
// http://RadicalResearch.co.uk/

// Example usage
// window.console.log = unpatch(window.console.log);

function unpatch(method) {
    var _ = Function.prototype.apply;
    var r;
    Function.prototype.apply = function () {
        r = this;
        Function.prototype.apply = _;
    };
    method();
    return r;
}