Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/extensions/extension_service_unittest.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 "chrome/browser/extensions/extension_service_unittest.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 402 matching lines @@
 }
 
 void ExtensionServiceTestBase::InitializeExtensionService(
     const FilePath& profile_path,
     const FilePath& pref_file,
     const FilePath& extensions_install_dir,
     bool autoupdate_enabled) {
   TestingProfile::Builder profile_builder;
   // Create a PrefService that only contains user defined preference values.
   scoped_ptr<PrefService> prefs(
-      PrefServiceMockBuilder().WithUserFilePrefs(pref_file).Create());
+      PrefServiceMockBuilder().WithUserFilePrefs(
+          pref_file, loop_.message_loop_proxy()).Create());
   Profile::RegisterUserPrefs(prefs.get());
   chrome::RegisterUserPrefs(prefs.get());
   profile_builder.SetPrefService(prefs.Pass());
   profile_builder.SetPath(profile_path);
   profile_ = profile_builder.Build();
 
   service_ = static_cast<extensions::TestExtensionSystem*>(
       ExtensionSystem::Get(profile_.get()))->CreateExtensionService(
           CommandLine::ForCurrentProcess(),
           extensions_install_dir,
@@ skipping 5232 matching lines @@
   EXPECT_FALSE(service_->IsExtensionEnabled(theme_crx));
 
   service_->EnableExtension(page_action);
   EXPECT_TRUE(extensions::HasExternalInstallError(service_));
   service_->EnableExtension(theme_crx);
   EXPECT_TRUE(extensions::HasExternalInstallError(service_));
   service_->EnableExtension(good_crx);
   EXPECT_FALSE(extensions::HasExternalInstallError(service_));
 }
 #endif  // ENABLE_EXTERNAL_INSTALL_UI