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

net/ocsp/nss_ocsp.cc

Index: net/ocsp/nss_ocsp.cc
===================================================================
--- net/ocsp/nss_ocsp.cc	(revision 54020)
+++ net/ocsp/nss_ocsp.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.
 
@@ -19,6 +19,7 @@
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/singleton.h"
+#include "base/string_util.h"
 #include "base/thread.h"
 #include "base/time.h"
 #include "googleurl/src/gurl.h"