Here is a quick tip to remove the piece of code added by WordPress 4.4 in the header of your pages about wp-embed.
wp-embed.js is a script added by wordpress
“It’s super easy to embed videos, images, tweets, audio, and other content into your WordPress site. This feature was added in WordPress 2.9″
That’s the code WordPress adds in your page:
wp_deregister_script( 'wp-embed' );
add_action( 'wp_footer', 'my_deregister_scripts' );
Read more at: https://codex.wordpress.org/Embeds