Refactor QuicClientSession so that it owns the underlying socket

net/quic/quic_connection.h

Index: net/quic/quic_connection.h
diff --git a/net/quic/quic_connection.h b/net/quic/quic_connection.h
index 17f0a11815db9eecefc0a997f297936d9f9e6588..6bde1207ba980359b7750aba000838c2bb24edf2 100644
--- a/net/quic/quic_connection.h
+++ b/net/quic/quic_connection.h
@@ -371,7 +371,7 @@ class NET_EXPORT_PRIVATE QuicConnection
   // Updates internal state based in incoming_ack.sent_info
   void UpdatePacketInformationSentByPeer(const QuicAckFrame& incoming_ack);
 
-  QuicConnectionHelperInterface* helper() { return helper_; }
+  QuicConnectionHelperInterface* helper() { return helper_.get(); }
 
  private:
   friend class test::QuicConnectionPeer;
@@ -461,7 +461,7 @@ class NET_EXPORT_PRIVATE QuicConnection
   // Closes any FEC groups protecting packets before |sequence_number|.
   void CloseFecGroupsBefore(QuicPacketSequenceNumber sequence_number);
 
-  QuicConnectionHelperInterface* helper_;
+  scoped_ptr<QuicConnectionHelperInterface> helper_;
   QuicFramer framer_;
   const QuicClock* clock_;
   QuicRandom* random_generator_;