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

net/url_request/url_request_ftp_job.cc

Index: net/url_request/url_request_ftp_job.cc
===================================================================
--- net/url_request/url_request_ftp_job.cc	(revision 54020)
+++ net/url_request/url_request_ftp_job.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -6,6 +6,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
+#include "base/utf_string_conversions.h"
 #include "net/base/auth.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"