Bug 1061894 - Clean up correctly in ownerdiscard.html. r=seth

image/test/crashtests/ownerdiscard.html

@@ -22,9 +22,7 @@
     var img = document.getElementById('victim');
     var observer = new ImageDecoderObserverStub();
     observer.discard = function() {
-      SpecialPowers.clearUserPref('min_discard_timeout_ms');
-      imgLoadingContent.removeObserver(gObserver);
-      setTimeout("document.documentElement.className = '';", 0);
+      cleanupAndFinish();
     }
     observer = SpecialPowers.wrapCallbackObject(observer);
     var gObserver = Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools)
@@ -39,10 +37,16 @@
       setTimeout(function() { document.adoptNode(tCF0); }, 0);
     }
     document.addEventListener("DOMContentLoaded", initCF, false);
-    function finish() {
-      setTimeout("document.documentElement.className = '';", 30000);
+
+    function cleanupAndFinish() {
+      SpecialPowers.clearUserPref('min_discard_timeout_ms');
+      imgLoadingContent.removeObserver(gObserver);
+      setTimeout("document.documentElement.className = '';", 0);
     }
-    window.addEventListener("load", finish, false);
+    function loadhandler() {
+      setTimeout("cleanupAndFinish();", 30000);
+    }
+    window.addEventListener("load", loadhandler, false);
   </script>
 </body>
 </html>