Ensure tests have an active task runner

chrome/browser/notifications/extension_welcome_notification_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 "chrome/browser/notifications/extension_welcome_notification.h"
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/test_simple_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_pref_service_syncable.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "sync/api/fake_sync_change_processor.h"
 #include "sync/api/sync_error_factory_mock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/message_center/fake_message_center.h"
 #include "ui/message_center/notification.h"
 
 class MockMessageCenter : public message_center::FakeMessageCenter {
@@ skipping 108 matching lines @@
     profile_.reset(new TestingProfile());
     delegate_ = new WelcomeNotificationDelegate();
     welcome_notification_.reset(
         ExtensionWelcomeNotification::Create(profile_.get(), delegate_));
   }
 
   void TearDown() override {
     delegate_ = NULL;
     welcome_notification_.reset();
     profile_.reset();
+    TestingBrowserProcess::DeleteInstance();
     thread_task_runner_handle_.reset();
     task_runner_ = NULL;
   }
 
   void StartPreferenceSyncing() const {
     PrefServiceSyncable::FromProfile(profile_.get())
         ->GetSyncableService(syncer::PREFERENCES)
         ->MergeDataAndStartSyncing(syncer::PREFERENCES,
                                    syncer::SyncDataList(),
                                    scoped_ptr<syncer::SyncChangeProcessor>(
@@ skipping 371 matching lines @@
 
   EXPECT_TRUE(task_runner()->GetPendingTasks().empty());
   EXPECT_EQ(message_center()->add_notification_calls(), 0);
   EXPECT_EQ(message_center()->remove_notification_calls(), 0);
   EXPECT_EQ(message_center()->notifications_with_shown_as_popup(), 0);
   EXPECT_FALSE(GetBooleanPref(prefs::kWelcomeNotificationDismissed));
   EXPECT_TRUE(GetBooleanPref(prefs::kWelcomeNotificationDismissedLocal));
   EXPECT_TRUE(GetBooleanPref(prefs::kWelcomeNotificationPreviouslyPoppedUp));
   EXPECT_EQ(GetInt64Pref(prefs::kWelcomeNotificationExpirationTimestamp), 1);
 }