removed unneeded method

lib/Twig/Template.php

@@ -488,12 +488,4 @@ abstract class Twig_Template implements Twig_TemplateInterface
 
         return $ret;
     }
-
-    /**
-     * This method is only useful when testing Twig. Do not use it.
-     */
-    public static function clearCache()
-    {
-        self::$cache = array();
-    }
 }

test/Twig/Tests/TemplateTest.php

@@ -396,7 +396,7 @@ class Twig_TemplateTest extends Twig_Template
     {
         parent::__construct($env);
         $this->useExtGetAttribute = $useExtGetAttribute;
-        Twig_Template::clearCache();
+        self::$cache = array();
     }
 
     public function getZero()