Embeds: Remove screencast.com from oEmbed allow list.

Screencast have updated their URL structure to use a sub-domain and the prior oEmbed endpoint in the allow list now returns a `410 Gone` response.

For discussion regarding the legacy endpoint refer to [comment:35:ticket:61941 #61941, comment #35] onwards.

See #61941.
Props audrasjb, brhodes, dustintechsmith, joedolson, johnbillion, nikunj8866, paulstanos, peterwilsoncc, sandeepdahiya, sergeybiryukov, sirlouen, swissspidy.


git-svn-id: https://develop.svn.wordpress.org/trunk@60345 602fd350-edb4-49c9-b593-d223f7449a82

Author: peterwilsoncc

src/wp-includes/class-wp-oembed.php

@@ -89,7 +89,6 @@ public function __construct() {
 			'#https?://videopress\.com/v/.*#'              => array( 'https://public-api.wordpress.com/oembed/?for=' . $host, true ),
 			'#https?://(www\.)?reddit\.com/r/[^/]+/comments/.*#i' => array( 'https://www.reddit.com/oembed', true ),
 			'#https?://(www\.)?speakerdeck\.com/.*#i'      => array( 'https://speakerdeck.com/oembed.{format}', true ),
-			'#https?://(www\.)?screencast\.com/.*#i'       => array( 'https://api.screencast.com/external/oembed', true ),
 			'#https?://([a-z0-9-]+\.)?amazon\.(com|com\.mx|com\.br|ca)/.*#i' => array( 'https://read.amazon.com/kp/api/oembed', true ),
 			'#https?://([a-z0-9-]+\.)?amazon\.(co\.uk|de|fr|it|es|in|nl|ru)/.*#i' => array( 'https://read.amazon.co.uk/kp/api/oembed', true ),
 			'#https?://([a-z0-9-]+\.)?amazon\.(co\.jp|com\.au)/.*#i' => array( 'https://read.amazon.com.au/kp/api/oembed', true ),
@@ -216,6 +215,7 @@ public function __construct() {
 		 * | Meetup.com   | meetup.com           | 3.9.0     | 6.0.1     |
 		 * | Meetup.com   | meetu.ps             | 3.9.0     | 6.0.1     |
 		 * | SlideShare   | slideshare.net       | 3.5.0     | 6.6.0     |
+		 * | Screencast   | screencast.com       | 4.8.0     | 6.8.2     |
 		 *
 		 * @see wp_oembed_add_provider()
 		 *