Remove trailing whitespace.

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

tests/HTMLPurifier/Strategy/ErrorsHarness.php

@@ -2,16 +2,16 @@
 
 class HTMLPurifier_Strategy_ErrorsHarness extends HTMLPurifier_ErrorsHarness
 {
-    
+
     // needs to be defined
     protected function getStrategy() {}
-    
+
     protected function invoke($input) {
         $strategy = $this->getStrategy();
         $lexer = new HTMLPurifier_Lexer_DirectLex();
         $tokens = $lexer->tokenizeHTML($input, $this->config, $this->context);
         $strategy->execute($tokens, $this->config, $this->context);
     }
-    
+
 }