Bug 1643382 - P1: BackgroundDataBridgeChild and HttpBackgroundChannelChild don't need to be a cycle r=dragana

Differential Revision: https://phabricator.services.mozilla.com/D79254

netwerk/ipc/SocketProcessChild.cpp

@@ -176,6 +176,11 @@ void SocketProcessChild::CleanUp() {
       iter.Data()->Close();
     }
   }
+
+  {
+    MutexAutoLock lock(mMutex);
+    mBackgroundDataBridgeMap.Clear();
+  }
   NS_ShutdownXPCOM(nullptr);
 }