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

net/http/http_auth_controller.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_controller.h"
 
-#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 #include "net/base/host_resolver.h"
 #include "net/base/net_util.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_request_info.h"
 
 namespace net {
 
 namespace {
@@ skipping 336 matching lines @@
 
 bool HttpAuthController::IsAuthSchemeDisabled(const std::string& scheme) const {
   return disabled_schemes_.find(scheme) != disabled_schemes_.end();
 }
 
 void HttpAuthController::DisableAuthScheme(const std::string& scheme) {
   disabled_schemes_.insert(scheme);
 }
 
 }  // namespace net