WordPress Remove Widget Titles

gistfile1.aw

<?php
// Register widgetized sidebar.
register_sidebar(array(
  // See: http://codex.wordpress.org/Function_Reference/register_sidebar
  'before_title' => '',
  'after_title' => ''
));

add_filter( 'widget_title', 'remove_widget_titles');
function remove_widget_titles( $widget_title ) {
  return;
}