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

net/base/transport_security_state.cc

Index: net/base/transport_security_state.cc
===================================================================
--- net/base/transport_security_state.cc	(revision 54020)
+++ net/base/transport_security_state.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.
 
@@ -12,6 +12,7 @@
 #include "base/sha2.h"
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/dns_util.h"