Remove trailing whitespace.

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

tests/HTMLPurifier/AttrTransformHarness.php

@@ -2,11 +2,11 @@
 
 class HTMLPurifier_AttrTransformHarness extends HTMLPurifier_ComplexHarness
 {
-    
+
     public function setUp() {
         parent::setUp();
         $this->func = 'transform';
     }
-    
+
 }