Fix for bug 485881 (test_bug409380.html has unbound variable r). r/sr=smaug.

--HG--
extra : rebase_source : 355574ce1a831e8ea1e06891b6d0a7b3b6cc57ed

content/base/test/test_bug409380.html

@@ -41,7 +41,7 @@ function runRangeTest()
      "It should be possible to select text node even if the node is not in DOM.");
   hadException = false;
   try {
-    r.insertNode(document.createTextNode('5'));
+    range.insertNode(document.createTextNode('5'));
   } catch (ex) {
     hadException = true;
   }