Revert "Bug 1782215 - Properly close the tab opened by the LoginCallb…

…ack when needed"

Fix the issue with the auth0-js package update to 9.22.0

This reverts commit 018de4c.

treeherder/config/settings.py

@@ -53,9 +53,6 @@
 # Send full URL within origin but only origin for cross-origin requests
 SECURE_REFERRER_POLICY = "origin-when-cross-origin"
 
-# Prevent window.opener from always being null while it's used in the frontend
-SECURE_CROSS_ORIGIN_OPENER_POLICY = None
-
 # We can't set X_FRAME_OPTIONS to DENY since renewal of an Auth0 token
 # requires opening the auth handler page in an invisible iframe with the
 # same origin.