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

chrome/browser/importer/toolbar_importer.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/importer/toolbar_importer.h"
 
 #include <limits>
 
 #include "base/rand_util.h"
+#include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/first_run.h"
 #include "chrome/browser/importer/importer_bridge.h"
 #include "chrome/browser/importer/importer_data_types.h"
 #include "chrome/browser/profile.h"
 #include "chrome/common/libxml_utils.h"
 #include "chrome/common/net/url_request_context_getter.h"
 #include "grit/generated_resources.h"
 #include "net/base/cookie_monster.h"
@@ skipping 568 matching lines @@
 void  Toolbar5Importer::AddBookmarksToChrome(
     const std::vector<ProfileWriter::BookmarkEntry>& bookmarks) {
   if (!bookmarks.empty() && !cancelled()) {
     const std::wstring& first_folder_name =
         bridge_->GetLocalizedString(IDS_BOOKMARK_GROUP_FROM_GOOGLE_TOOLBAR);
     int options = ProfileWriter::ADD_IF_UNIQUE |
         (import_to_bookmark_bar() ? ProfileWriter::IMPORT_TO_BOOKMARK_BAR : 0);
     bridge_->AddBookmarkEntries(bookmarks, first_folder_name, options);
   }
 }