Refactor QuicClientSession so that it owns the underlying socket

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 6eef75c89beaca07d2060286b3b0cf254b24ee05..a43a9b25b78012d5fb07b81b1f472c1a5a715bce 100644
--- a/net/quic/test_tools/quic_test_utils.cc
+++ b/net/quic/test_tools/quic_test_utils.cc
@@ -130,16 +130,14 @@ QuicRandom* MockHelper::GetRandomGenerator() {
 MockConnection::MockConnection(QuicGuid guid,
                                IPEndPoint address,
                                bool is_server)
-    : QuicConnection(guid, address, new MockHelper(), is_server),
-      helper_(helper()) {
+    : QuicConnection(guid, address, new MockHelper(), is_server) {
 }
 
 MockConnection::MockConnection(QuicGuid guid,
                                IPEndPoint address,
                                QuicConnectionHelperInterface* helper,
                                bool is_server)
-    : QuicConnection(guid, address, helper, is_server),
-      helper_(helper) {
+    : QuicConnection(guid, address, helper, is_server) {
 }
 
 MockConnection::~MockConnection() {