Secure embeds in the editor (first run):

- When the user pastes an embeddable http URL, try to get the https embed.
- If an embed provider doesn't support ssl embeds, show a placeholder/error message.
- Revise the way we return error messages.
See #28195, #28507.

git-svn-id: https://develop.svn.wordpress.org/trunk@28919 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/misc.php

@@ -824,15 +824,3 @@ function heartbeat_autosave( $response, $data ) {
 }
 // Run later as we have to set DOING_AUTOSAVE for back-compat
 add_filter( 'heartbeat_received', 'heartbeat_autosave', 500, 2 );
-
-/**
- * Send error message when an URL cannot be embedded. Used in wp_ajax_parse_embed().
- *
- * @access private
- * @since 4.0
- */
-function _wpview_embed_error( $output, $url ) {
-	wp_send_json_error( array(
-		'message' => sprintf( __( '%s failed to embed.' ), esc_url( $url ) ),
-	) );
-}