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 b1c2657b8cc7eebf72eaf455cf5148491687241b..7d5e22289d539edf323b1a87d907984e62287c6b 100644
--- a/net/quic/test_tools/quic_test_utils.cc
+++ b/net/quic/test_tools/quic_test_utils.cc
@@ -114,15 +114,13 @@ QuicRandom* MockHelper::GetRandomGenerator() {
 }
 
 MockConnection::MockConnection(QuicGuid guid, IPEndPoint address)
-    : QuicConnection(guid, address, new MockHelper()),
-      helper_(helper()) {
+    : QuicConnection(guid, address, new MockHelper()) {
 }
 
 MockConnection::MockConnection(QuicGuid guid,
                                IPEndPoint address,
                                QuicConnectionHelperInterface* helper)
-    : QuicConnection(guid, address, helper),
-      helper_(helper) {
+    : QuicConnection(guid, address, helper) {
 }
 
 MockConnection::~MockConnection() {