Add missing prefixed attributes, introduced in [33023].

See ##32589.

Built from https://develop.svn.wordpress.org/trunk@33050


git-svn-id: http://core.svn.wordpress.org/trunk@33021 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/forms-rtl.css

@@ -443,6 +443,8 @@ fieldset label,
 	padding: 3px 5px;
 	text-align: center;
 	width: 25em;
+	-webkit-box-sizing: border-box;
+	-moz-box-sizing: border-box;
 	box-sizing: border-box;
 	opacity: 0;
 }

wp-admin/css/forms.css

@@ -443,6 +443,8 @@ fieldset label,
 	padding: 3px 5px;
 	text-align: center;
 	width: 25em;
+	-webkit-box-sizing: border-box;
+	-moz-box-sizing: border-box;
 	box-sizing: border-box;
 	opacity: 0;
 }

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-beta1-33049';
+$wp_version = '4.3-beta1-33050';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.