Implement Google Plus Commenting to WordPress blog without using Plugin - Twenty eleven theme

gplus.php

<?php
/**
 * The template for displaying Comments.
 *
 * The area of the page that contains both current comments
 * and the comment form. The actual display of comments is
 * handled by a callback to twentyeleven_comment() which is
 * located in the functions.php file.
 *
 * @package WordPress
 * @subpackage Twenty_Eleven
 * @since Twenty Eleven 1.0
 */
?>

<script src="https://apis.google.com/js/plusone.js">
</script>

<div class="g-comments"
data-href="<?php the_permalink(); ?>"
data-width="800"
data-first_party_property="BLOGGER"
data-view_type="FILTERED_POSTMOD">
</div>