Remove trailing whitespace.

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

library/HTMLPurifier/AttrTransform.php

@@ -2,13 +2,13 @@
 
 /**
  * Processes an entire attribute array for corrections needing multiple values.
- * 
+ *
  * Occasionally, a certain attribute will need to be removed and popped onto
  * another value.  Instead of creating a complex return syntax for
  * HTMLPurifier_AttrDef, we just pass the whole attribute array to a
  * specialized object and have that do the special work.  That is the
  * family of HTMLPurifier_AttrTransform.
- * 
+ *
  * An attribute transformation can be assigned to run before or after
  * HTMLPurifier_AttrDef validation.  See HTMLPurifier_HTMLDefinition for
  * more details.
@@ -16,10 +16,10 @@
 
 abstract class HTMLPurifier_AttrTransform
 {
-    
+
     /**
      * Abstract: makes changes to the attributes dependent on multiple values.
-     * 
+     *
      * @param $attr Assoc array of attributes, usually from
      *              HTMLPurifier_Token_Tag::$attr
      * @param $config Mandatory HTMLPurifier_Config object.
@@ -27,7 +27,7 @@ abstract class HTMLPurifier_AttrTransform
      * @returns Processed attribute array.
      */
     abstract public function transform($attr, $config, $context);
-    
+
     /**
      * Prepends CSS properties to the style attribute, creating the
      * attribute if it doesn't exist.
@@ -38,7 +38,7 @@ abstract class HTMLPurifier_AttrTransform
         $attr['style'] = isset($attr['style']) ? $attr['style'] : '';
         $attr['style'] = $css . $attr['style'];
     }
-    
+
     /**
      * Retrieves and removes an attribute
      * @param $attr Attribute array to process (passed by reference)
@@ -50,6 +50,6 @@ abstract class HTMLPurifier_AttrTransform
         unset($attr[$key]);
         return $value;
     }
-    
+
 }