net: Cleanup class/struct forward declarations

net/spdy/spdy_write_queue.h

 // Copyright (c) 2013 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_WRITE_QUEUE_H_
 #define NET_SPDY_SPDY_WRITE_QUEUE_H_
 
 #include <deque>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
 #include "net/spdy/spdy_protocol.h"
 
 namespace net {
 
-class SpdyBuffer;
 class SpdyBufferProducer;
 class SpdyStream;
 
 // A queue of SpdyBufferProducers to produce frames to write. Ordered
 // by priority, and then FIFO.
 class NET_EXPORT_PRIVATE SpdyWriteQueue {
  public:
   SpdyWriteQueue();
   ~SpdyWriteQueue();
 
@@ skipping 54 matching lines @@
 
   // The actual write queue, binned by priority.
   std::deque<PendingWrite> queue_[NUM_PRIORITIES];
 
   DISALLOW_COPY_AND_ASSIGN(SpdyWriteQueue);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_WRITE_QUEUE_H_