CrOS: Do not allow notifications to be added during shutdown.

chrome/browser/chromeos/hats/hats_notification_controller_unittest.cc

 // Copyright 2016 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/chromeos/hats/hats_notification_controller.h"
 
 #include "base/strings/string_split.h"
 #include "chrome/browser/notifications/message_center_notification_manager.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
@@ skipping 94 matching lines @@
             g_browser_process->notification_ui_manager());
     manager->SetMessageCenterTrayDelegateForTest(
         new message_center::FakeMessageCenterTrayDelegate(
             message_center::MessageCenter::Get()));
 
     network_portal_detector::InitializeForTesting(
         &mock_network_portal_detector_);
   }
 
   void TearDown() override {
-    g_browser_process->notification_ui_manager()->CancelAll();
+    g_browser_process->notification_ui_manager()->StartShutdown();
     profile_manager_.reset();
     network_portal_detector::InitializeForTesting(nullptr);
     BrowserWithTestWindowTest::TearDown();
   }
 
   scoped_refptr<HatsNotificationController> InstantiateHatsController() {
     MockImageFetcher* mock_image_fetcher_ = new MockImageFetcher;
     // The initialization will fail since the function IsNewDevice() will return
     // true.
     scoped_refptr<HatsNotificationController> hats_notification_controller =
@@ skipping 154 matching lines @@
   ASSERT_TRUE(base::Time::FromInternalValue(new_timestamp) >
               base::Time::FromInternalValue(now_timestamp));
 
   // Destructor for HatsController removes self from observer list.
   EXPECT_CALL(mock_network_portal_detector_,
               RemoveObserver(hats_notification_controller.get()))
       .Times(1);
 }
 
 }  // namespace chromeos