Fix strict warning

gfx/thebes/crashtests/394384-1.html

@@ -4,7 +4,7 @@
 
 function boom()
 {
-  t1 = document.createTextNode(String.fromCharCode(0x2011) + String.fromCharCode(13));
+  var t1 = document.createTextNode(String.fromCharCode(0x2011) + String.fromCharCode(13));
   document.body.appendChild(t1);
   
   setTimeout(boom2, 30);
@@ -12,7 +12,7 @@ function boom()
 
 function boom2()
 {
-  letterA = document.createTextNode(String.fromCharCode(65));
+  var letterA = document.createTextNode(String.fromCharCode(65));
   document.body.appendChild(letterA);
 
   document.documentElement.removeAttribute("class");