Adds QUIC_VERSION_24 which uses SPDY/4 header compression instead of SPDY/3.

net/quic/quic_session.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A QuicSession, which demuxes a single connection to individual streams.
 
 #ifndef NET_QUIC_QUIC_SESSION_H_
 #define NET_QUIC_QUIC_SESSION_H_
 
 #include <map>
@@ skipping 50 matching lines @@
 
   // QuicConnectionVisitorInterface methods:
   void OnStreamFrames(const std::vector<QuicStreamFrame>& frames) override;
   void OnRstStream(const QuicRstStreamFrame& frame) override;
   void OnGoAway(const QuicGoAwayFrame& frame) override;
   void OnWindowUpdateFrames(
       const std::vector<QuicWindowUpdateFrame>& frames) override;
   void OnBlockedFrames(const std::vector<QuicBlockedFrame>& frames) override;
   void OnConnectionClosed(QuicErrorCode error, bool from_peer) override;
   void OnWriteBlocked() override {}
-  void OnSuccessfulVersionNegotiation(const QuicVersion& version) override {}
+  void OnSuccessfulVersionNegotiation(const QuicVersion& version) override;
   void OnCanWrite() override;
   void OnCongestionWindowChange(QuicTime now) override {}
   bool WillingAndAbleToWrite() const override;
   bool HasPendingHandshake() const override;
   bool HasOpenDataStreams() const override;
 
   // Called by the headers stream when headers have been received for a stream.
   virtual void OnStreamHeaders(QuicStreamId stream_id,
                                base::StringPiece headers_data);
   // Called by the headers stream when headers with a priority have been
@@ skipping 250 matching lines @@
 
   // Indicate if there is pending data for the crypto stream.
   bool has_pending_handshake_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SESSION_H_