Allow QuicConnection to own its QuicPacketWriter

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 5bed086017795f183c1a2824bc7c309eaa204d31..a7e8a7e0f89c6cd19ec720023e10117046bfff71 100644
--- a/net/quic/quic_connection.h
+++ b/net/quic/quic_connection.h
@@ -223,11 +223,13 @@ class NET_EXPORT_PRIVATE QuicConnection
   };
 
   // Constructs a new QuicConnection for |connection_id| and |address|.
-  // |helper| and |writer| must outlive this connection.
+  // |helper| must outlive this connection, and if |owns_writer| is false, so
+  // must |writer|.
   QuicConnection(QuicConnectionId connection_id,
                  IPEndPoint address,
                  QuicConnectionHelperInterface* helper,
                  QuicPacketWriter* writer,
+                 bool owns_writer,
                  bool is_server,
                  const QuicVersionVector& supported_versions);
   virtual ~QuicConnection();
@@ -632,7 +634,8 @@ class NET_EXPORT_PRIVATE QuicConnection
 
   QuicFramer framer_;
   QuicConnectionHelperInterface* helper_;  // Not owned.
-  QuicPacketWriter* writer_;  // Not owned.
+  QuicPacketWriter* writer_;  // Owned or not depending on |owns_writer_|.
+  bool owns_writer_;
   EncryptionLevel encryption_level_;
   const QuicClock* clock_;
   QuicRandom* random_generator_;