Add a merely pass-through QuicMultipathSentPacketManager. Protected behind blocked flag FLAGS_quic_…

net/quic/test_tools/quic_test_utils.cc

Index: net/quic/test_tools/quic_test_utils.cc
diff --git a/net/quic/test_tools/quic_test_utils.cc b/net/quic/test_tools/quic_test_utils.cc
index fd5aa94714273b41203ab4fc2805d99bb0a99ab5..47f12516a27a61036228edce85e3f260bc0b676a 100644
--- a/net/quic/test_tools/quic_test_utils.cc
+++ b/net/quic/test_tools/quic_test_utils.cc
@@ -832,6 +832,14 @@ MockReceivedPacketManager::MockReceivedPacketManager(QuicConnectionStats* stats)
 
 MockReceivedPacketManager::~MockReceivedPacketManager() {}
 
+MockSentPacketManager::MockSentPacketManager() {}
+
+MockSentPacketManager::~MockSentPacketManager() {}
+
+MockConnectionCloseDelegate::MockConnectionCloseDelegate() {}
+
+MockConnectionCloseDelegate::~MockConnectionCloseDelegate() {}
+
 void CreateClientSessionForTest(QuicServerId server_id,
                                 bool supports_stateless_rejects,
                                 QuicTime::Delta connection_start_time,