Reduce header dependencies in net/

net/base/upload_data_stream.h

 // Copyright (c) 2006-2008 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_BASE_UPLOAD_DATA_STREAM_H_
 #define NET_BASE_UPLOAD_DATA_STREAM_H_
 
 #include "net/base/file_stream.h"
-#include "net/base/io_buffer.h"
 #include "net/base/upload_data.h"
 
 namespace net {
 
+class IOBuffer;
+
 class UploadDataStream {
  public:
   explicit UploadDataStream(const UploadData* data);
   ~UploadDataStream();
 
   // Returns the stream's buffer and buffer length.
   IOBuffer* buf() const { return buf_; }
   size_t buf_len() const { return buf_len_; }
 
   // Call to indicate that a portion of the stream's buffer was consumed.  This
@@ skipping 36 matching lines @@
   // Size and current read position within the stream.
   uint64 total_size_;
   uint64 current_position_;
 
   DISALLOW_EVIL_CONSTRUCTORS(UploadDataStream);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_UPLOAD_DATA_STREAM_H_