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-rw-r--r--dom/ipc/tests/test_window_open_discarded_bc.html2
1 files changed, 1 insertions, 1 deletions
diff --git a/dom/ipc/tests/test_window_open_discarded_bc.html b/dom/ipc/tests/test_window_open_discarded_bc.html
index 4cd81463e0..fae731d068 100644
--- a/dom/ipc/tests/test_window_open_discarded_bc.html
+++ b/dom/ipc/tests/test_window_open_discarded_bc.html
@@ -11,7 +11,7 @@ add_task(async function() {
const TOPIC = "dangerous:test-only:new-browser-child-ready";
let found = false;
- function observer(subject, topic, data) {
+ function observer(subject) {
let win = SpecialPowers.wrap(subject);
if (SpecialPowers.compare(win.opener, window)) {
found = true;