Remove -Wno-unused-private-field clang warning suppression.

net/http/http_auth_handler_negotiate.h

 // Copyright (c) 2011 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_NEGOTIATE_H_
 #define NET_HTTP_HTTP_AUTH_HANDLER_NEGOTIATE_H_
 
 #include <string>
 
 #include "build/build_config.h"
@@ skipping 65 matching lines @@
                           int digest_nonce_count,
                           const BoundNetLog& net_log,
                           scoped_ptr<HttpAuthHandler>* handler) override;
 
    private:
     bool disable_cname_lookup_;
     bool use_port_;
     HostResolver* resolver_;
 #if defined(OS_WIN)
     ULONG max_token_length_;
-    bool first_creation_;
 #endif
     bool is_unsupported_;
     scoped_ptr<AuthLibrary> auth_library_;
   };
 
   HttpAuthHandlerNegotiate(AuthLibrary* sspi_library,
 #if defined(OS_WIN)
                            ULONG max_token_length,
 #endif
                            URLSecurityManager* url_security_manager,
@@ skipping 61 matching lines @@
   std::string* auth_token_;
 
   State next_state_;
 
   const URLSecurityManager* url_security_manager_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_NEGOTIATE_H_