After [34629], use `$size_class` instead of `$size`.

See #32093.

Built from https://develop.svn.wordpress.org/trunk@34657


git-svn-id: http://core.svn.wordpress.org/trunk@34621 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -767,7 +767,7 @@ function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = fa
 		$attachment = get_post($attachment_id);
 		$default_attr = array(
 			'src'	=> $src,
-			'class'	=> "attachment-$size_class size-$size",
+			'class'	=> "attachment-$size_class size-$size_class",
 			'alt'	=> trim(strip_tags( get_post_meta($attachment_id, '_wp_attachment_image_alt', true) )), // Use Alt field first
 		);
 		if ( empty($default_attr['alt']) )

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34656';
+$wp_version = '4.4-alpha-34657';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.