Use HttpRequestHeaders for extra_headers.

net/http/http_auth_handler.h

 // Copyright (c) 2010 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_HTTP_HTTP_AUTH_HANDLER_H_
 #define NET_HTTP_HTTP_AUTH_HANDLER_H_
 
 #include <string>
 
 #include "base/ref_counted.h"
 #include "net/http/http_auth.h"
 
 namespace net {
 
-class HttpRequestInfo;
+struct HttpRequestInfo;
 class ProxyInfo;
 
 // HttpAuthHandler is the interface for the authentication schemes
 // (basic, digest, NTLM, Negotiate).
 // HttpAuthHandler objects are typically created by an HttpAuthHandlerFactory.
 class HttpAuthHandler : public base::RefCounted<HttpAuthHandler> {
  public:
   // Initializes the handler using a challenge issued by a server.
   // |challenge| must be non-NULL and have already tokenized the
   // authentication scheme, but none of the tokens occuring after the
@@ skipping 112 matching lines @@
   // origin server.
   HttpAuth::Target target_;
 
   // A bitmask of the properties of the authentication scheme.
   int properties_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_H_