Remove some deprecated file_util wstring functions.

chrome/browser/importer/firefox2_importer.cc

 // Copyright (c) 2006-2008 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/importer/firefox2_importer.h"
 
 #include "app/l10n_util.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/i18n/icu_string_conversions.h"
@@ skipping 273 matching lines @@
   // Initializes NSS3.
   NSSDecryptor decryptor;
   if (!decryptor.Init(source_path_, source_path_) &&
       !decryptor.Init(app_path_, source_path_))
     return;
 
   // Firefox 2 uses signons2.txt to store the pssswords. If it doesn't
   // exist, we try to find its older version.
   std::wstring file = source_path_;
   file_util::AppendToPath(&file, L"signons2.txt");
-  if (!file_util::PathExists(file)) {
+  if (!file_util::PathExists(FilePath::FromWStringHack(file))) {
     file = source_path_;
     file_util::AppendToPath(&file, L"signons.txt");
   }
 
   std::string content;
   file_util::ReadFileToString(file, &content);
   std::vector<PasswordForm> forms;
   decryptor.ParseSignons(content, &forms);
 
   if (!cancelled()) {
@@ skipping 263 matching lines @@
 
   // We need to make up a URL for the favicon. We use a version of the page's
   // URL so that we can be sure it will not collide.
   usage.favicon_url = GURL(std::string("made-up-favicon:") + link_url.spec());
 
   // We only have one URL per favicon for Firefox 2 bookmarks.
   usage.urls.insert(link_url);
 
   favicons->push_back(usage);
 }