Bug 1681457 - Allow non-auxiliary BrowsingContexts created by script to close themselves, r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D211792

dom/base/Document.cpp

@@ -18988,7 +18988,7 @@ bool Document::IsLikelyContentInaccessibleTopLevelAboutBlank() const {
   // really reliable but doesn't affect the correctness of our page probes, so
   // it's not too terrible.
   BrowsingContext* bc = GetBrowsingContext();
-  return bc && bc->IsTop() && !bc->HadOriginalOpener();
+  return bc && bc->IsTop() && !bc->GetTopLevelCreatedByWebContent();
 }
 
 bool Document::ShouldIncludeInTelemetry() const {