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

chrome/browser/notifications/notification_test_util.cc

Index: chrome/browser/notifications/notification_test_util.cc
diff --git a/chrome/browser/notifications/notification_test_util.cc b/chrome/browser/notifications/notification_test_util.cc
index 491c54e7ff1ccc1657b06a5dcc0304effdaa93e1..f9c31b6a7d02708a0264c0c5284a5096e165a087 100644
--- a/chrome/browser/notifications/notification_test_util.cc
+++ b/chrome/browser/notifications/notification_test_util.cc
@@ -52,6 +52,9 @@ bool StubNotificationUIManager::SilentDismissById(
 
 void StubNotificationUIManager::Add(const Notification& notification,
                                     Profile* profile) {
+  if (is_shutdown_started_)
+    return;
+
   notifications_.push_back(std::make_pair(
       notification, NotificationUIManager::GetProfileID(profile)));
 
@@ -154,6 +157,11 @@ void StubNotificationUIManager::CancelAll() {
   notifications_.clear();
 }
 
+void StubNotificationUIManager::StartShutdown() {
+  is_shutdown_started_ = true;
+  CancelAll();
+}
+
 FullscreenStateWaiter::FullscreenStateWaiter(
     Browser* browser, bool desired_state)
     : browser_(browser),