Use GetSwitchValueASCII.

chrome/test/unit/chrome_test_suite.h

 // 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.
 
 #ifndef CHROME_TEST_UNIT_CHROME_TEST_SUITE_H_
 #define CHROME_TEST_UNIT_CHROME_TEST_SUITE_H_
 
 #include <string>
 
 #include "build/build_config.h"
@@ skipping 68 matching lines @@
     scoped_host_resolver_proc_.Init(host_resolver_proc_.get());
 
     chrome::RegisterPathProvider();
     app::RegisterPathProvider();
     g_browser_process = new TestingBrowserProcess;
 
     // Notice a user data override, and otherwise default to using a custom
     // user data directory that lives alongside the current app.
     // NOTE: The user data directory will be erased before each UI test that
     //       uses it, in order to ensure consistency.
-    FilePath user_data_dir = FilePath::FromWStringHack(
-        CommandLine::ForCurrentProcess()->GetSwitchValue(
-            switches::kUserDataDir));
+    FilePath user_data_dir =
+        CommandLine::ForCurrentProcess()->GetSwitchValuePath(
+            switches::kUserDataDir);
     if (user_data_dir.empty() &&
         file_util::CreateNewTempDirectory(FILE_PATH_LITERAL("chrome_test_"),
                                           &user_data_dir)) {
       user_data_dir = user_data_dir.AppendASCII("test_user_data");
     }
     if (!user_data_dir.empty())
       PathService::Override(chrome::DIR_USER_DATA, user_data_dir);
 
 #if defined(OS_MACOSX)
     // Look in the framework bundle for resources.
@@ skipping 39 matching lines @@
     TestSuite::Shutdown();
   }
 
   StatsTable* stats_table_;
   ScopedOleInitializer ole_initializer_;
   scoped_refptr<WarningHostResolverProc> host_resolver_proc_;
   net::ScopedDefaultHostResolverProc scoped_host_resolver_proc_;
 };
 
 #endif  // CHROME_TEST_UNIT_CHROME_TEST_SUITE_H_