Move ASCIIToWide and ASCIIToUTF16 to utf_string_conversions.h. I've found it...

net/http/http_auth_handler_negotiate.cc

 // 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.
 
 #include "net/http/http_auth_handler_negotiate.h"
 
 #include "base/logging.h"
+#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 #include "net/base/address_family.h"
 #include "net/base/host_resolver.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_auth_filter.h"
 #include "net/http/url_security_manager.h"
 
 namespace net {
 
 HttpAuthHandlerNegotiate::HttpAuthHandlerNegotiate(
     AuthLibrary* auth_library,
@@ skipping 289 matching lines @@
                                    resolver_, disable_cname_lookup_,
                                    use_port_));
   if (!tmp_handler->InitFromChallenge(challenge, target, origin, net_log))
     return ERR_INVALID_RESPONSE;
   handler->swap(tmp_handler);
   return OK;
 #endif
 }
 
 }  // namespace net