Remove trailing whitespace.

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

library/HTMLPurifier/ChildDef.php

@@ -10,20 +10,20 @@ abstract class HTMLPurifier_ChildDef
      * Used occasionally in terms of context.
      */
     public $type;
-    
+
     /**
      * Bool that indicates whether or not an empty array of children is okay
-     * 
+     *
      * This is necessary for redundant checking when changes affecting
      * a child node may cause a parent node to now be disallowed.
      */
     public $allow_empty;
-    
+
     /**
      * Lookup array of all elements that this definition could possibly allow
      */
     public $elements = array();
-    
+
     /**
      * Get lookup of tag names that should not close this element automatically.
      * All other elements will do so.
@@ -31,10 +31,10 @@ abstract class HTMLPurifier_ChildDef
     public function getNonAutoCloseElements($config) {
         return $this->elements;
     }
-    
+
     /**
      * Validates nodes according to definition and returns modification.
-     * 
+     *
      * @param $tokens_of_children Array of HTMLPurifier_Token
      * @param $config HTMLPurifier_Config object
      * @param $context HTMLPurifier_Context object