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Editing: class.jetpack-iframe-embed.php

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<?php
/**
 * Tweak the preview when rendered in an iframe
 */

class Jetpack_Iframe_Embed {
	static function init() {
		if ( ! self::is_embedding_in_iframe() ) {
			return;
		}

// Disable the admin bar
		if ( ! defined( 'IFRAME_REQUEST' ) ) {
			define( 'IFRAME_REQUEST', true );
		}

// Prevent canonical redirects
		remove_filter( 'template_redirect', 'redirect_canonical' );

add_action( 'wp_head', array( 'Jetpack_Iframe_Embed', 'noindex' ), 1 );
		add_action( 'wp_head', array( 'Jetpack_Iframe_Embed', 'base_target_blank' ), 1 );

add_filter( 'shortcode_atts_video', array( 'Jetpack_Iframe_Embed', 'disable_autoplay' ) );
		add_filter( 'shortcode_atts_audio', array( 'Jetpack_Iframe_Embed', 'disable_autoplay' ) );

if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
			wp_enqueue_script( 'jetpack-iframe-embed', WPMU_PLUGIN_URL . '/jetpack-iframe-embed/jetpack-iframe-embed.js', array( 'jquery' ) );
		} else {
			$ver = sprintf( '%s-%s', gmdate( 'oW' ), defined( 'JETPACK__VERSION' ) ? JETPACK__VERSION : '' );
			wp_enqueue_script( 'jetpack-iframe-embed', '//s0.wp.com/wp-content/mu-plugins/jetpack-iframe-embed/jetpack-iframe-embed.js', array( 'jquery' ), $ver );
		}
		wp_localize_script( 'jetpack-iframe-embed', '_previewSite', array( 'siteURL' => get_site_url() ) );
	}

static function is_embedding_in_iframe() {
		return (
			self::has_iframe_get_param() && (
				self::has_preview_get_param() ||
				self::has_preview_theme_preview_param()
			)
		);
	}

private static function has_iframe_get_param() {
		return isset( $_GET['iframe'] ) && $_GET['iframe'] === 'true';
	}

private static function has_preview_get_param() {
		return isset( $_GET['preview'] ) && $_GET['preview'] === 'true';
	}

private static function has_preview_theme_preview_param() {
		return isset( $_GET['theme_preview'] ) && $_GET['theme_preview'] === 'true';
	}

/**
	 * Disable `autoplay` shortcode attribute in context of an iframe
	 * Added via `shortcode_atts_video` & `shortcode_atts_audio` in `init`
	 *
	 * @param  array $atts The output array of shortcode attributes.
	 *
	 * @return array       The output array of shortcode attributes.
	 */
	static function disable_autoplay( $atts ) {
		return array_merge( $atts, array( 'autoplay' => false ) );
	}

/**
	 * We don't want search engines to index iframe previews
	 * Added via `wp_head` action in `init`
	 */
	static function noindex() {
		echo '<meta name="robots" content="noindex,nofollow" />';
	}

/**
	 * Make sure all links and forms open in a new window by default
	 * (unless overridden on client-side by JS)
	 * Added via `wp_head` action in `init`
	 */
	static function base_target_blank() {
		echo '<base target="_blank" />';
	}
}

Editing: class.jetpack-iframe-embed.php

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