Bug 1682141: Stop searching for top window if top contex has no window context. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D100325

dom/base/DocGroup.cpp

@@ -248,7 +248,7 @@ RefPtr<PerformanceInfoPromise> DocGroup::ReportPerformanceInfo() {
 
     top = context->Top();
 
-    if (!top) {
+    if (!top || !top->GetCurrentWindowContext()) {
       continue;
     }