Release SpdySession socket read buffer

net/spdy/spdy_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.
 
 #ifndef NET_SPDY_SPDY_SESSION_H_
 #define NET_SPDY_SPDY_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1001 matching lines @@
   // |pool_| owns us, therefore its lifetime must exceed ours.
   SpdySessionPool* pool_;
   HttpServerProperties* http_server_properties_;
 
   TransportSecurityState* transport_security_state_;
 
   // The socket handle for this session.
   std::unique_ptr<ClientSocketHandle> connection_;
 
   // The read buffer used to read data from the socket.
+  // Non-null if there is a Read() pending.
   scoped_refptr<IOBuffer> read_buffer_;
 
   SpdyStreamId stream_hi_water_mark_;  // The next stream id to use.
 
   // Used to ensure the server increments push stream ids correctly.
   SpdyStreamId last_accepted_push_stream_id_;
 
   // Queue, for each priority, of pending stream requests that have
   // not yet been satisfied.
   PendingStreamRequestQueue pending_create_stream_queues_[NUM_PRIORITIES];
@@ skipping 187 matching lines @@
   // Used for posting asynchronous IO tasks.  We use this even though
   // SpdySession is refcounted because we don't need to keep the SpdySession
   // alive if the last reference is within a RunnableMethod.  Just revoke the
   // method.
   base::WeakPtrFactory<SpdySession> weak_factory_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_SESSION_H_