Ensure tests have an active task runner

chrome/browser/supervised_user/legacy/supervised_user_shared_settings_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 <string>
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/supervised_user/legacy/supervised_user_shared_settings_service.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/fake_sync_change_processor.h"
 #include "sync/api/sync_change.h"
 #include "sync/api/sync_change_processor_wrapper_for_test.h"
 #include "sync/api/sync_error_factory_mock.h"
 #include "sync/protocol/sync.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::DictionaryValue;
 using base::FundamentalValue;
 using base::StringValue;
@@ skipping 100 matching lines @@
   void TearDown() override { settings_service_.Shutdown(); }
 
   void OnSettingChanged(const std::string& su_id, const std::string& key) {
     const Value* value = settings_service_.GetValue(su_id, key);
     ASSERT_TRUE(value);
     changed_settings_.push_back(
         SupervisedUserSharedSettingsService::CreateSyncDataForSetting(
             su_id, key, *value, true));
   }
 
+  content::TestBrowserThreadBundle thread_bundle_;
   TestingProfile profile_;
   SupervisedUserSharedSettingsService settings_service_;
   SyncDataList changed_settings_;
 
   scoped_ptr<CallbackList::Subscription> subscription_;
 
   scoped_ptr<syncer::FakeSyncChangeProcessor> sync_processor_;
 };
 
 TEST_F(SupervisedUserSharedSettingsServiceTest, Empty) {
@@ skipping 120 matching lines @@
       settings_service_.GetAllSyncData(SUPERVISED_USER_SHARED_SETTINGS).size());
   EXPECT_EQ(ToJson(&name),
             ToJson(settings_service_.GetValue(kIdA, "name")));
   EXPECT_EQ(ToJson(&age), ToJson(settings_service_.GetValue(kIdA, "age")));
   EXPECT_EQ(ToJson(&bar), ToJson(settings_service_.GetValue(kIdB, "foo")));
   EXPECT_EQ(ToJson(&blurp), ToJson(settings_service_.GetValue(kIdC, "baz")));
   EXPECT_FALSE(settings_service_.GetValue(kIdA, "foo"));
   EXPECT_FALSE(settings_service_.GetValue(kIdB, "name"));
   EXPECT_FALSE(settings_service_.GetValue(kIdC, "name"));
 }