Bug 1626278: Filter stats for closed PeerConnections the same way we do for live ones. r=ng

Differential Revision: https://phabricator.services.mozilla.com/D88498

dom/media/webrtc/jsapi/WebrtcGlobalInformation.cpp

@@ -105,8 +105,10 @@ GetStatsPromiseForThisProcess(const nsAString& aPcIdFilter) {
 
     // Grab stats for closed PCs
     for (const auto& report : ctx->mStatsForClosedPeerConnections) {
-      promises.AppendElement(dom::RTCStatsReportPromise::CreateAndResolve(
-          MakeUnique<dom::RTCStatsReportInternal>(report), __func__));
+      if (aPcIdFilter.IsEmpty() || aPcIdFilter == report.mPcid) {
+        promises.AppendElement(dom::RTCStatsReportPromise::CreateAndResolve(
+            MakeUnique<dom::RTCStatsReportInternal>(report), __func__));
+      }
     }
   }