Ensure tests have an active task runner

chrome/browser/supervised_user/supervised_user_whitelist_service_unittest.cc

 // Copyright 2014 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 <map>
 #include <set>
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/component_updater/supervised_user_whitelist_installer.h"
 #include "chrome/browser/supervised_user/supervised_user_site_list.h"
 #include "chrome/browser/supervised_user/supervised_user_whitelist_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "sync/api/sync_change.h"
 #include "sync/api/sync_error_factory.h"
 #include "sync/protocol/sync.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 const char kClientId[] = "client-id";
 
 class MockSupervisedUserWhitelistInstaller
@@ skipping 111 matching lines @@
     return nullptr;
   }
 
   void OnSiteListsChanged(
       const std::vector<scoped_refptr<SupervisedUserSiteList>>& site_lists) {
     site_lists_ = site_lists;
     if (!site_lists_changed_callback_.is_null())
       site_lists_changed_callback_.Run();
   }
 
-  base::MessageLoop message_loop_;
+  content::TestBrowserThreadBundle thread_bundle_;
   TestingProfile profile_;
 
   scoped_ptr<MockSupervisedUserWhitelistInstaller> installer_;
   scoped_ptr<SupervisedUserWhitelistService> service_;
 
   std::vector<scoped_refptr<SupervisedUserSiteList>> site_lists_;
   base::Closure site_lists_changed_callback_;
 };
 
 TEST_F(SupervisedUserWhitelistServiceTest, MergeEmpty) {
@@ skipping 102 matching lines @@
       service_->GetAllSyncData(syncer::SUPERVISED_USER_WHITELISTS);
   ASSERT_EQ(2u, sync_data.size());
   const sync_pb::ManagedUserWhitelistSpecifics* whitelist =
       FindWhitelist(sync_data, "aaaa");
   ASSERT_TRUE(whitelist);
   EXPECT_EQ("Whitelist A", whitelist->name());
   whitelist = FindWhitelist(sync_data, "bbbb");
   ASSERT_TRUE(whitelist);
   EXPECT_EQ("Whitelist B", whitelist->name());
 }