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

net/http/http_auth_handler_ntlm.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_NTLM_H_
 #define NET_HTTP_HTTP_AUTH_HANDLER_NTLM_H_
 
 #include "build/build_config.h"
 
 // This contains the portable and the SSPI implementations for NTLM.
@@ skipping 42 matching lines @@
     // this are unit tests which pass in a mocked-out version of the SSPI
     // library.  After the call |sspi_library| will be owned by this Factory and
     // will be destroyed when the Factory is destroyed.
     void set_sspi_library(SSPILibrary* sspi_library) {
       sspi_library_.reset(sspi_library);
     }
 #endif  // defined(NTLM_SSPI)
    private:
 #if defined(NTLM_SSPI)
     ULONG max_token_length_;
-    bool first_creation_;
     bool is_unsupported_;
     scoped_ptr<SSPILibrary> sspi_library_;
 #endif  // defined(NTLM_SSPI)
   };
 
 #if defined(NTLM_PORTABLE)
   // A function that generates n random bytes in the output buffer.
   typedef void (*GenerateRandomProc)(uint8* output, size_t n);
 
   // A function that returns the local host name. Returns an empty string if
@@ skipping 89 matching lines @@
   std::string auth_data_;
 
 #if defined(NTLM_SSPI)
   URLSecurityManager* url_security_manager_;
 #endif
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_AUTH_HANDLER_NTLM_H_