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

chrome/browser/net/view_http_cache_job_factory.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 "chrome/browser/net/view_http_cache_job_factory.h"
 
 #include "base/message_loop.h"
+#include "base/string_util.h"
 #include "chrome/common/url_constants.h"
 #include "net/base/net_errors.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_simple_job.h"
 #include "net/url_request/view_cache_helper.h"
 
 namespace {
 
 // A job subclass that dumps an HTTP cache entry.
@@ skipping 81 matching lines @@
 bool ViewHttpCacheJobFactory::IsSupportedURL(const GURL& url) {
   return StartsWithASCII(url.spec(), chrome::kNetworkViewCacheURL,
                          true /*case_sensitive*/);
 }
 
 // Static.
 URLRequestJob* ViewHttpCacheJobFactory::CreateJobForRequest(
     URLRequest* request) {
   return new ViewHttpCacheJob(request);
 }