Use HttpRequestHeaders for extra_headers.

net/http/http_stream.h

 // Copyright (c) 2009 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.
 //
 // HttpStream is an interface for reading and writing data to an HttpStream that
 // keeps the client agnostic of the actual underlying transport layer.  This
 // provides an abstraction for both a basic http stream as well as http
 // pipelining implementations.
 
 #ifndef NET_HTTP_HTTP_STREAM_H_
 #define NET_HTTP_HTTP_STREAM_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "net/base/completion_callback.h"
 
 namespace net {
 
-class HttpRequestInfo;
+struct HttpRequestInfo;
 class HttpResponseInfo;
 class IOBuffer;
 class UploadDataStream;
 
 class HttpStream {
  public:
   HttpStream() {}
   virtual ~HttpStream() {}
 
   // Writes the headers and uploads body data to the underlying socket.
@@ skipping 47 matching lines @@
   // as part of the next pipelined response) has been read from the socket.
   virtual bool IsMoreDataBuffered() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HttpStream);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_H_