Remove usage of deprecated functions AppendToPath and ToWStringHack in importer_unittest.cc

chrome/browser/importer/importer_unittest.cc

Index: chrome/browser/importer/importer_unittest.cc
diff --git a/chrome/browser/importer/importer_unittest.cc b/chrome/browser/importer/importer_unittest.cc
index d47e9e96968097cbf34e7ba9a1dcb69d212c6421..0e1e8a96ba9ee05a844010aa5c570f54725d832c 100644
--- a/chrome/browser/importer/importer_unittest.cc
+++ b/chrome/browser/importer/importer_unittest.cc
@@ -358,8 +358,7 @@ void WritePStore(IPStore* pstore, const GUID* type, const GUID* subtype) {
 TEST_F(ImporterTest, IEImporter) {
   // Sets up a favorites folder.
   app::win::ScopedCOMInitializer com_init;
-  std::wstring path = test_path_.ToWStringHack();
-  file_util::AppendToPath(&path, L"Favorites");
+  std::wstring path = test_path_.AppendASCII("Favorites").value();
   CreateDirectory(path.c_str(), NULL);
   CreateDirectory((path + L"\\SubFolder").c_str(), NULL);
   CreateDirectory((path + L"\\Links").c_str(), NULL);