[cros] Fake a stub user login when no --login-manager and --login-user are given.

chrome/browser/ui/prefs/prefs_tab_helper_browsertest.cc

 // Copyright (c) 2012 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 "base/file_util.h"
 #include "base/path_service.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/testing_profile.h"
 
 class PrefsTabHelperBrowserTest : public InProcessBrowserTest {
  protected:
   virtual FilePath GetPreferencesFilePath() {
     FilePath test_data_directory;
     PathService::Get(chrome::DIR_TEST_DATA, &test_data_directory);
     return test_data_directory
         .AppendASCII("profiles")
         .AppendASCII("webkit_global_migration")
         .AppendASCII("Default")
         .Append(chrome::kPreferencesFilename);
   }
 
   virtual bool SetUpUserDataDirectory() OVERRIDE {
     FilePath user_data_directory;
     PathService::Get(chrome::DIR_USER_DATA, &user_data_directory);
-    FilePath default_profile = user_data_directory.AppendASCII("Default");
+    FilePath default_profile =
+        user_data_directory.AppendASCII(TestingProfile::kTestUserProfileDir);
     if (!file_util::CreateDirectory(default_profile)) {
       LOG(ERROR) << "Can't create " << default_profile.MaybeAsASCII();
       return false;
     }
     FilePath non_global_pref_file = GetPreferencesFilePath();
     if (!file_util::PathExists(non_global_pref_file)) {
       LOG(ERROR) << "Doesn't exist " << non_global_pref_file.MaybeAsASCII();
       return false;
     }
     FilePath default_pref_file =
@@ skipping 116 matching lines @@
             prefs->GetString(prefs::kWebKitFantasyFontFamily));
   EXPECT_EQ("FixedFontFamily",
             prefs->GetString(prefs::kWebKitFixedFontFamily));
   EXPECT_EQ("SansSerifFontFamily",
             prefs->GetString(prefs::kWebKitSansSerifFontFamily));
   EXPECT_EQ("SerifFontFamily",
             prefs->GetString(prefs::kWebKitSerifFontFamily));
   EXPECT_EQ("StandardFontFamily",
             prefs->GetString(prefs::kWebKitStandardFontFamily));
 };