Fix subtle bug with the in-process utility thread usage in unit tests.

chrome/browser/extensions/extension_service_unittest.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_UNITTEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_UNITTEST_H_
 
 #include "base/at_exit.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "content/public/test/test_browser_thread_bundle.h"
+#include "content/public/test/test_utils.h"
 #include "extensions/common/feature_switch.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/chromeos/settings/device_settings_service.h"
 #endif
 
 class TestingProfile;
@@ skipping 61 matching lines @@
   content::TestBrowserThreadBundle thread_bundle_;
   base::ScopedTempDir temp_dir_;
   scoped_ptr<TestingProfile> profile_;
   base::FilePath extensions_install_dir_;
   base::FilePath data_dir_;
   // Managed by extensions::ExtensionSystemFactory.
   ExtensionService* service_;
   extensions::ManagementPolicy* management_policy_;
   scoped_ptr<ExtensionSyncService> extension_sync_service_;
   size_t expected_extensions_count_;
+  content::InProcessUtilityThreadHelper in_process_utility_thread_helper_;
 
 #if defined OS_CHROMEOS
   chromeos::ScopedTestDeviceSettingsService test_device_settings_service_;
   chromeos::ScopedTestCrosSettings test_cros_settings_;
   chromeos::ScopedTestUserManager test_user_manager_;
 #endif
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_UNITTEST_H_