Index: wp-includes/class.wp-styles.php
===================================================================
--- wp-includes/class.wp-styles.php	(revision 20100)
+++ wp-includes/class.wp-styles.php	(working copy)
@@ -135,7 +135,7 @@
 	}
 
 	function _css_href( $src, $ver, $handle ) {
-		if ( !is_bool($src) && !preg_match('|^https?://|', $src) && ! ( $this->content_url && 0 === strpos($src, $this->content_url) ) ) {
+		if ( !is_bool($src) && !preg_match('|^(https?:)?//|', $src) && ! ( $this->content_url && 0 === strpos($src, $this->content_url) ) ) {
 			$src = $this->base_url . $src;
 		}
 
Index: wp-includes/class.wp-scripts.php
===================================================================
--- wp-includes/class.wp-scripts.php	(revision 20100)
+++ wp-includes/class.wp-scripts.php	(working copy)
@@ -112,7 +112,7 @@
 		}
 
 		$this->print_extra_script( $handle );
-		if ( !preg_match('|^https?://|', $src) && ! ( $this->content_url && 0 === strpos($src, $this->content_url) ) ) {
+		if ( !preg_match('|^(https?:)?//|', $src) && ! ( $this->content_url && 0 === strpos($src, $this->content_url) ) ) {
 			$src = $this->base_url . $src;
 		}