Delete link click event handler to delete the file.

gistfile1.js

function initEventHandlers() {
  // ...
  //
  $('#fileList').on('click', 'a.delete-link', function() {
    var key = $(this).parents('li').data('key');
    if (confirm('Are you sure you want to delete the file "' + key + '" ?')) {
      bucket.deleteObject({ Key: key }, function (err) {
        updateFileList();
      });
    }
  });
}