Embeds: Remove support for oEmbedded videos from Vine.

* Vine effectively shut down in December 2016.
* The oEmbed endpoint no longer works and returns a 404.
* Developer documentation for Vine has been removed.

Fixes #41817

Built from https://develop.svn.wordpress.org/trunk@41347


git-svn-id: http://core.svn.wordpress.org/trunk@41180 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-press-this.php

@@ -459,7 +459,7 @@ class WP_Press_This {
 	 * Limit embed source URLs to specific providers.
 	 *
 	 * Not all core oEmbed providers are supported. Supported providers include YouTube, Vimeo,
-	 * Vine, Daily Motion, SoundCloud, and Twitter.
+	 * Daily Motion, SoundCloud, and Twitter.
 	 *
 	 * @ignore
 	 * @since 4.2.0
@@ -482,9 +482,6 @@ class WP_Press_This {
 		} else if ( preg_match( '!//vimeo\.com/moogaloop\.swf\?clip_id=([\d]+)$!i', $src, $src_matches ) ) {
 			// Embedded Vimeo Flash videos
 			$src = 'https://vimeo.com/' . (int) $src_matches[1];
-		} else if ( preg_match( '!//vine\.co/v/([^/]+)/embed!i', $src, $src_matches ) ) {
-			// Embedded Vine videos
-			$src = 'https://vine.co/v/' . $src_matches[1];
 		} else if ( preg_match( '!//(www\.)?dailymotion\.com/embed/video/([^/?]+)([/?].+)?!i', $src, $src_matches ) ) {
 			// Embedded Daily Motion videos
 			$src = 'https://www.dailymotion.com/video/' . $src_matches[2];