Remove trailing whitespace.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

library/HTMLPurifier/AttrDef/CSS/URI.php

@@ -11,45 +11,45 @@
  */
 class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
 {
-    
+
     public function __construct() {
         parent::__construct(true); // always embedded
     }
-    
+
     public function validate($uri_string, $config, $context) {
         // parse the URI out of the string and then pass it onto
         // the parent object
-        
+
         $uri_string = $this->parseCDATA($uri_string);
         if (strpos($uri_string, 'url(') !== 0) return false;
         $uri_string = substr($uri_string, 4);
         $new_length = strlen($uri_string) - 1;
         if ($uri_string[$new_length] != ')') return false;
         $uri = trim(substr($uri_string, 0, $new_length));
-        
+
         if (!empty($uri) && ($uri[0] == "'" || $uri[0] == '"')) {
             $quote = $uri[0];
             $new_length = strlen($uri) - 1;
             if ($uri[$new_length] !== $quote) return false;
             $uri = substr($uri, 1, $new_length - 1);
         }
-        
+
         $keys   = array(  '(',   ')',   ',',   ' ',   '"',   "'");
         $values = array('\\(', '\\)', '\\,', '\\ ', '\\"', "\\'");
         $uri = str_replace($values, $keys, $uri);
-        
+
         $result = parent::validate($uri, $config, $context);
-        
+
         if ($result === false) return false;
-        
+
         // escape necessary characters according to CSS spec
         // except for the comma, none of these should appear in the
         // URI at all
         $result = str_replace($keys, $values, $result);
-        
+
         return "url($result)";
-        
+
     }
-    
+
 }