Adds async interface method to PersistentPrefStore.

chrome/browser/chromeos/login/signed_settings_temp_storage_unittest.cc

 // Copyright (c) 2011 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/chromeos/login/signed_settings_temp_storage.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <vector>
@@ skipping 12 matching lines @@
   virtual void SetUp() {
     ref_map_["some_stuff"] = "a=35;code=64";
     ref_map_["another_stuff"] = "";
     ref_map_["name"] = "value";
     ref_map_["2bc6aa16-e0ea-11df-b13d-18a90520e2e5"] = "512";
 
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     FilePath temp_file;
     ASSERT_TRUE(
         file_util::CreateTemporaryFileInDir(temp_dir_.path(), &temp_file));
-    local_state_.reset(PrefService::CreatePrefService(temp_file, NULL, NULL));
+    local_state_.reset(
+        PrefService::CreatePrefService(temp_file, NULL, NULL, false));
     ASSERT_TRUE(NULL != local_state_.get());
     SignedSettingsTempStorage::RegisterPrefs(local_state_.get());
   }
 
   std::map<std::string, std::string> ref_map_;
   ScopedTempDir temp_dir_;
   scoped_ptr<PrefService> local_state_;
 };
 
 TEST_F(SignedSettingsTempStorageTest, Basic) {
@@ skipping 23 matching lines @@
     EXPECT_TRUE(SignedSettingsTempStorage::Retrieve(b_list[i]->first, &value,
                                                     local_state_.get()));
     EXPECT_EQ(b_list[i]->second, value);
     EXPECT_FALSE(SignedSettingsTempStorage::Retrieve("non-existent tv-series",
                                                      &value,
                                                      local_state_.get()));
   }
 }
 
 }  // namespace chromeos