Backed out changeset ee2d0bbca72c (bug 1159632) for windows xpcshell permafail

toolkit/components/jsdownloads/test/unit/head.js

@@ -137,15 +137,8 @@ function getTempFile(aLeafName)
   do_check_false(file.exists());
 
   do_register_cleanup(function () {
-    try {
+    if (file.exists()) {
       file.remove(false);
-    } catch (ex if (ex instanceof Components.Exception &&
-                    (ex.result == Cr.NS_ERROR_FILE_ACCESS_DENIED ||
-                     ex.result == Cr.NS_ERROR_FILE_TARGET_DOES_NOT_EXIST))) {
-        // On Windows, we may get an access denied error if the file existed before,
-        // and was recently deleted.
-        // Don't bother checking file.exists() as that may also cause an access
-        // denied error.
     }
   });