Refactoring: Create per-connection packet writers in QuicDispatcher.

net/quic/quic_server_session.h

Index: net/quic/quic_server_session.h
diff --git a/net/quic/quic_server_session.h b/net/quic/quic_server_session.h
index 49c03373ed0357f9acdbabf8e37f13b89e00fff0..344feb21e6a0d7050b786b8b68689a1572efc14d 100644
--- a/net/quic/quic_server_session.h
+++ b/net/quic/quic_server_session.h
@@ -44,10 +44,8 @@ class QuicServerSessionVisitor {
 
 class QuicServerSession : public QuicSession {
  public:
-  // Takes ownership of connection_packet_writer
   QuicServerSession(const QuicConfig& config,
                     QuicConnection* connection,
-                    QuicPerConnectionPacketWriter* connection_packet_writer,
                     QuicServerSessionVisitor* visitor);
 
   // Override the base class to notify the owner of the connection close.
@@ -83,7 +81,6 @@ class QuicServerSession : public QuicSession {
   friend class test::QuicServerSessionPeer;
 
   scoped_ptr<QuicCryptoServerStream> crypto_stream_;
-  scoped_ptr<QuicPerConnectionPacketWriter> connection_packet_writer_;
   QuicServerSessionVisitor* visitor_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicServerSession);