net: Cleanup class/struct forward declarations

net/spdy/spdy_http_stream.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_HTTP_STREAM_H_
 #define NET_SPDY_SPDY_HTTP_STREAM_H_
 
 #include <stdint.h>
 
 #include <list>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/http/http_stream.h"
 #include "net/spdy/spdy_read_queue.h"
 #include "net/spdy/spdy_session.h"
 #include "net/spdy/spdy_stream.h"
 
 namespace net {
 
-class DrainableIOBuffer;
 struct HttpRequestInfo;
 class HttpResponseInfo;
 class IOBuffer;
 class SpdySession;
 class UploadDataStream;
 
 // The SpdyHttpStream is a HTTP-specific type of stream known to a SpdySession.
 class NET_EXPORT_PRIVATE SpdyHttpStream : public SpdyStream::Delegate,
                                           public HttpStream {
  public:
@@ skipping 161 matching lines @@
   bool was_alpn_negotiated_;
 
   base::WeakPtrFactory<SpdyHttpStream> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SpdyHttpStream);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_HTTP_STREAM_H_