Makes migration on write error asynchronous to avoid reentrancy issues

net/quic/chromium/mock_network_change_notifier.cc

Index: net/quic/chromium/mock_network_change_notifier.cc
diff --git a/net/quic/chromium/mock_network_change_notifier.cc b/net/quic/chromium/mock_network_change_notifier.cc
index ee9687c6a8de36cb46e7fabba632edfaabd1b3d7..141e37e0712337d106420f9b04ee7862a3694bc2 100644
--- a/net/quic/chromium/mock_network_change_notifier.cc
+++ b/net/quic/chromium/mock_network_change_notifier.cc
@@ -39,18 +39,28 @@ void MockNetworkChangeNotifier::GetCurrentConnectedNetworks(
 
 void MockNetworkChangeNotifier::NotifyNetworkMadeDefault(
     NetworkChangeNotifier::NetworkHandle network) {
+  QueueNetworkMadeDefault(network);
+  // Spin the message loop so the notification is delivered.
+  base::RunLoop().RunUntilIdle();
+}
+
+void MockNetworkChangeNotifier::QueueNetworkMadeDefault(
+    NetworkChangeNotifier::NetworkHandle network) {
   NetworkChangeNotifier::NotifyObserversOfSpecificNetworkChange(
       NetworkChangeNotifier::MADE_DEFAULT, network);
+}
+
+void MockNetworkChangeNotifier::NotifyNetworkDisconnected(
+    NetworkChangeNotifier::NetworkHandle network) {
+  QueueNetworkDisconnected(network);
   // Spin the message loop so the notification is delivered.
   base::RunLoop().RunUntilIdle();
 }
 
-void MockNetworkChangeNotifier::NotifyNetworkDisconnected(
+void MockNetworkChangeNotifier::QueueNetworkDisconnected(
     NetworkChangeNotifier::NetworkHandle network) {
   NetworkChangeNotifier::NotifyObserversOfSpecificNetworkChange(
       NetworkChangeNotifier::DISCONNECTED, network);
-  // Spin the message loop so the notification is delivered.
-  base::RunLoop().RunUntilIdle();
 }
 
 ScopedMockNetworkChangeNotifier::ScopedMockNetworkChangeNotifier()