Makes migration on write error asynchronous to avoid reentrancy issues

net/quic/chromium/mock_network_change_notifier.h

Index: net/quic/chromium/mock_network_change_notifier.h
diff --git a/net/quic/chromium/mock_network_change_notifier.h b/net/quic/chromium/mock_network_change_notifier.h
index e5316f8944fffeb26750578d7567130759d478f1..de9ef7a51db7f462a5d240edb55893b1cd6c1791 100644
--- a/net/quic/chromium/mock_network_change_notifier.h
+++ b/net/quic/chromium/mock_network_change_notifier.h
@@ -25,10 +25,20 @@ class MockNetworkChangeNotifier : public NetworkChangeNotifier {
 
   void GetCurrentConnectedNetworks(NetworkList* network_list) const override;
 
+  // Delivers a MADE_DEFAULT notification to observers.
   void NotifyNetworkMadeDefault(NetworkChangeNotifier::NetworkHandle network);
 
+  // Queues a MADE_DEFAULT notification to be delivered to observers
+  // but does not spin the message loop to actually deliver it.
+  void QueueNetworkMadeDefault(NetworkChangeNotifier::NetworkHandle network);
+
+  // Delivers a DISCONNECTED notification to observers.
   void NotifyNetworkDisconnected(NetworkChangeNotifier::NetworkHandle network);
 
+  // Queues a DISCONNECTED notification to be delivered to observers
+  // but does not spin the message loop to actually deliver it.
+  void QueueNetworkDisconnected(NetworkChangeNotifier::NetworkHandle network);
+
  private:
   bool force_network_handles_supported_;
   NetworkChangeNotifier::NetworkList connected_networks_;