Migrates QUIC sessions to a new network when old network is (about to be) disconnected.

net/socket/socket_test_util.h

Index: net/socket/socket_test_util.h
diff --git a/net/socket/socket_test_util.h b/net/socket/socket_test_util.h
index 13f7b39799ccc15f392ab4647e9612a7c8f6e712..e7a9326bb3ad45f590536dfc9c0510e82c9d7faf 100644
--- a/net/socket/socket_test_util.h
+++ b/net/socket/socket_test_util.h
@@ -861,7 +861,7 @@ class DeterministicMockUDPClientSocket
   // DatagramClientSocket implementation.
   int BindToNetwork(NetworkChangeNotifier::NetworkHandle network) override;
   int BindToDefaultNetwork() override;
-  NetworkChangeNotifier::NetworkHandle GetBoundNetwork() override;
+  NetworkChangeNotifier::NetworkHandle GetBoundNetwork() const override;
   int Connect(const IPEndPoint& address) override;
 
   void set_source_port(uint16 port) { source_port_ = port; }
@@ -991,7 +991,7 @@ class MockUDPClientSocket : public DatagramClientSocket, public AsyncSocket {
   // DatagramClientSocket implementation.
   int BindToNetwork(NetworkChangeNotifier::NetworkHandle network) override;
   int BindToDefaultNetwork() override;
-  NetworkChangeNotifier::NetworkHandle GetBoundNetwork() override;
+  NetworkChangeNotifier::NetworkHandle GetBoundNetwork() const override;
   int Connect(const IPEndPoint& address) override;
 
   // AsyncSocket implementation.